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    27. 

  27.       <h1 class="title">std/deques</h1>
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  54.   <li><a class="reference" id="see-also_toc" href="#see-also">See also</a></li>
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  55. <li>
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  56.   <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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  57. </li>
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  59.   <details open>
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  60.     <summary><a class="reference reference-toplevel" href="#7" id="57">Types</a></summary>
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  61.     <ul class="simple simple-toc-section">
    62. 

  62.       <li><a class="reference" href="#Deque" title="Deque[T] = object">Deque</a></li>
    63. 

  63. 

  64.     </ul>
    65. 

  65.   </details>
    66. 

  66. </li>
    67. 

  67. <li>
    68. 

  68.   <details open>
    69. 

  69.     <summary><a class="reference reference-toplevel" href="#10" id="60">Consts</a></summary>
    70. 

  70.     <ul class="simple simple-toc-section">
    71. 

  71.       <li><a class="reference" href="#defaultInitialSize" title="defaultInitialSize = 4">defaultInitialSize</a></li>
    72. 

  72. 

  73.     </ul>
    74. 

  74.   </details>
    75. 

  75. </li>
    76. 

  76. <li>
    77. 

  77.   <details open>
    78. 

  78.     <summary><a class="reference reference-toplevel" href="#12" id="62">Procs</a></summary>
    79. 

  79.     <ul class="simple simple-toc-section">
    80. 

  80.       <ul class="simple nested-toc-section">$
    81. 

  81.   <li><a class="reference" href="#%24%2CDeque%5BT%5D" title="`$`[T](deq: Deque[T]): string">`$`[T](deq: Deque[T]): string</a></li>
    82. 

  82. 

  83. </ul>
    84. 

  84. <ul class="simple nested-toc-section">==
    85. 

  85.   <li><a class="reference" href="#%3D%3D%2CDeque%5BT%5D%2CDeque%5BT%5D" title="`==`[T](deq1, deq2: Deque[T]): bool">`==`[T](deq1, deq2: Deque[T]): bool</a></li>
    86. 

  86. 

  87. </ul>
    88. 

  88. <ul class="simple nested-toc-section">[]
    89. 

  89.   <li><a class="reference" href="#%5B%5D%2CDeque%5BT%5D%2CBackwardsIndex" title="`[]`[T](deq: Deque[T]; i: BackwardsIndex): lent T">`[]`[T](deq: Deque[T]; i: BackwardsIndex): lent T</a></li>
    90. 

  90. <li><a class="reference" href="#%5B%5D%2CDeque%5BT%5D%2CNatural" title="`[]`[T](deq: Deque[T]; i: Natural): lent T">`[]`[T](deq: Deque[T]; i: Natural): lent T</a></li>
    91. 

  91. <li><a class="reference" href="#%5B%5D%2CDeque%5BT%5D%2CBackwardsIndex_2" title="`[]`[T](deq: var Deque[T]; i: BackwardsIndex): var T">`[]`[T](deq: var Deque[T]; i: BackwardsIndex): var T</a></li>
    92. 

  92. <li><a class="reference" href="#%5B%5D%2CDeque%5BT%5D%2CNatural_2" title="`[]`[T](deq: var Deque[T]; i: Natural): var T">`[]`[T](deq: var Deque[T]; i: Natural): var T</a></li>
    93. 

  93. 

  94. </ul>
    95. 

  95. <ul class="simple nested-toc-section">[]=
    96. 

  96.   <li><a class="reference" href="#%5B%5D%3D%2CDeque%5BT%5D%2CBackwardsIndex%2CsinkT" title="`[]=`[T](deq: var Deque[T]; i: BackwardsIndex; x: sink T)">`[]=`[T](deq: var Deque[T]; i: BackwardsIndex; x: sink T)</a></li>
    97. 

  97. <li><a class="reference" href="#%5B%5D%3D%2CDeque%5BT%5D%2CNatural%2CsinkT" title="`[]=`[T](deq: var Deque[T]; i: Natural; val: sink T)">`[]=`[T](deq: var Deque[T]; i: Natural; val: sink T)</a></li>
    98. 

  98. 

  99. </ul>
    100. 

  100. <ul class="simple nested-toc-section">addFirst
    101. 

  101.   <li><a class="reference" href="#addFirst%2CDeque%5BT%5D%2CsinkT" title="addFirst[T](deq: var Deque[T]; item: sink T)">addFirst[T](deq: var Deque[T]; item: sink T)</a></li>
    102. 

  102. 

  103. </ul>
    104. 

  104. <ul class="simple nested-toc-section">addLast
    105. 

  105.   <li><a class="reference" href="#addLast%2CDeque%5BT%5D%2CsinkT" title="addLast[T](deq: var Deque[T]; item: sink T)">addLast[T](deq: var Deque[T]; item: sink T)</a></li>
    106. 

  106. 

  107. </ul>
    108. 

  108. <ul class="simple nested-toc-section">clear
    109. 

  109.   <li><a class="reference" href="#clear%2CDeque%5BT%5D" title="clear[T](deq: var Deque[T])">clear[T](deq: var Deque[T])</a></li>
    110. 

  110. 

  111. </ul>
    112. 

  112. <ul class="simple nested-toc-section">contains
    113. 

  113.   <li><a class="reference" href="#contains%2CDeque%5BT%5D%2CT" title="contains[T](deq: Deque[T]; item: T): bool">contains[T](deq: Deque[T]; item: T): bool</a></li>
    114. 

  114. 

  115. </ul>
    116. 

  116. <ul class="simple nested-toc-section">hash
    117. 

  117.   <li><a class="reference" href="#hash%2CDeque%5BT%5D" title="hash[T](deq: Deque[T]): Hash">hash[T](deq: Deque[T]): Hash</a></li>
    118. 

  118. 

  119. </ul>
    120. 

  120. <ul class="simple nested-toc-section">initDeque
    121. 

  121.   <li><a class="reference" href="#initDeque%2Cint" title="initDeque[T](initialSize: int = defaultInitialSize): Deque[T]">initDeque[T](initialSize: int = defaultInitialSize): Deque[T]</a></li>
    122. 

  122. 

  123. </ul>
    124. 

  124. <ul class="simple nested-toc-section">len
    125. 

  125.   <li><a class="reference" href="#len%2CDeque%5BT%5D" title="len[T](deq: Deque[T]): int">len[T](deq: Deque[T]): int</a></li>
    126. 

  126. 

  127. </ul>
    128. 

  128. <ul class="simple nested-toc-section">peekFirst
    129. 

  129.   <li><a class="reference" href="#peekFirst%2CDeque%5BT%5D" title="peekFirst[T](deq: Deque[T]): lent T">peekFirst[T](deq: Deque[T]): lent T</a></li>
    130. 

  130. <li><a class="reference" href="#peekFirst%2CDeque%5BT%5D_2" title="peekFirst[T](deq: var Deque[T]): var T">peekFirst[T](deq: var Deque[T]): var T</a></li>
    131. 

  131. 

  132. </ul>
    133. 

  133. <ul class="simple nested-toc-section">peekLast
    134. 

  134.   <li><a class="reference" href="#peekLast%2CDeque%5BT%5D" title="peekLast[T](deq: Deque[T]): lent T">peekLast[T](deq: Deque[T]): lent T</a></li>
    135. 

  135. <li><a class="reference" href="#peekLast%2CDeque%5BT%5D_2" title="peekLast[T](deq: var Deque[T]): var T">peekLast[T](deq: var Deque[T]): var T</a></li>
    136. 

  136. 

  137. </ul>
    138. 

  138. <ul class="simple nested-toc-section">popFirst
    139. 

  139.   <li><a class="reference" href="#popFirst%2CDeque%5BT%5D" title="popFirst[T](deq: var Deque[T]): T">popFirst[T](deq: var Deque[T]): T</a></li>
    140. 

  140. 

  141. </ul>
    142. 

  142. <ul class="simple nested-toc-section">popLast
    143. 

  143.   <li><a class="reference" href="#popLast%2CDeque%5BT%5D" title="popLast[T](deq: var Deque[T]): T">popLast[T](deq: var Deque[T]): T</a></li>
    144. 

  144. 

  145. </ul>
    146. 

  146. <ul class="simple nested-toc-section">shrink
    147. 

  147.   <li><a class="reference" href="#shrink%2CDeque%5BT%5D%2Cint%2Cint" title="shrink[T](deq: var Deque[T]; fromFirst = 0; fromLast = 0)">shrink[T](deq: var Deque[T]; fromFirst = 0; fromLast = 0)</a></li>
    148. 

  148. 

  149. </ul>
    150. 

  150. <ul class="simple nested-toc-section">toDeque
    151. 

  151.   <li><a class="reference" href="#toDeque%2CopenArray%5BT%5D" title="toDeque[T](x: openArray[T]): Deque[T]">toDeque[T](x: openArray[T]): Deque[T]</a></li>
    152. 

  152. 

  153. </ul>
    154. 

  154. 

  155.     </ul>
    156. 

  156.   </details>
    157. 

  157. </li>
    158. 

  158. <li>
    159. 

  159.   <details open>
    160. 

  160.     <summary><a class="reference reference-toplevel" href="#15" id="65">Iterators</a></summary>
    161. 

  161.     <ul class="simple simple-toc-section">
    162. 

  162.       <ul class="simple nested-toc-section">items
    163. 

  163.   <li><a class="reference" href="#items.i%2CDeque%5BT%5D" title="items[T](deq: Deque[T]): lent T">items[T](deq: Deque[T]): lent T</a></li>
    164. 

  164. 

  165. </ul>
    166. 

  166. <ul class="simple nested-toc-section">mitems
    167. 

  167.   <li><a class="reference" href="#mitems.i%2CDeque%5BT%5D" title="mitems[T](deq: var Deque[T]): var T">mitems[T](deq: var Deque[T]): var T</a></li>
    168. 

  168. 

  169. </ul>
    170. 

  170. <ul class="simple nested-toc-section">pairs
    171. 

  171.   <li><a class="reference" href="#pairs.i%2CDeque%5BT%5D" title="pairs[T](deq: Deque[T]): tuple[key: int, val: T]">pairs[T](deq: Deque[T]): tuple[key: int, val: T]</a></li>
    172. 

  172. 

  173. </ul>
    174. 

  174. 

  175.     </ul>
    176. 

  176.   </details>
    177. 

  177. </li>
    178. 

  178. 

  179. </ul>
    180. 

  180. 

  181.   </div>
    182. 

  182.   <div class="nine columns" id="content">
    183. 

  183.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    184. 

  184. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    185. 

  185. 

  186.     <div id="tocRoot"></div>
    187. 

  187.     
    188. 

  188.     <p class="module-desc">An implementation of a <span id="deque_1">deque</span> (double-ended queue). The underlying implementation uses a <tt class="docutils literal"><span class="pre"><span class="Identifier">seq</span></span></tt>.<div class="admonition admonition-info"><span class="admonition-info-text"><b>Note:</b></span>
    189. 

  189. None of the procs that get an individual value from the deque should be used on an empty deque.</div>
    190. 

  190. <p>If compiled with the <tt class="docutils literal"><span class="pre"><span class="Identifier">boundChecks</span></span></tt> option, those procs will raise an <tt class="docutils literal"><span class="pre"><span class="Identifier">IndexDefect</span></span></tt> on such access. This should not be relied upon, as <tt class="docutils literal"><span class="pre"><span class="Operator">-</span><span class="Identifier">d</span><span class="Punctuation">:</span><span class="Identifier">danger</span></span></tt> or <tt class="docutils literal"><span class="pre"><span class="Operator">--</span><span class="Identifier">checks</span><span class="Punctuation">:</span><span class="Identifier">off</span></span></tt> will disable those checks and then the procs may return garbage or crash the program.</p>
    191. 

  191. <p>As such, a check to see if the deque is empty is needed before any access, unless your program logic guarantees it indirectly.</p>
    192. 

  192. 

  193. <p><strong class="examples_text">Example:</strong></p>
    194. 

  194. <pre class="listing"><span class="Keyword">import</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">deques</span>
    195. 

  195. <span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    196. 

  196. 

  197. <span class="Identifier">doAssertRaises</span><span class="Punctuation">(</span><span class="Identifier">IndexDefect</span><span class="Punctuation">,</span> <span class="Identifier">echo</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">4</span><span class="Punctuation">]</span><span class="Punctuation">)</span>
    198. 

  198. 

  199. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addLast</span><span class="Punctuation">(</span><span class="DecNumber">50</span><span class="Punctuation">)</span>
    200. 

  200. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    201. 

  201. 

  202. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">peekFirst</span> <span class="Operator">==</span> <span class="DecNumber">10</span>
    203. 

  203. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">peekLast</span> <span class="Operator">==</span> <span class="DecNumber">50</span>
    204. 

  204. <span class="Identifier">assert</span> <span class="Identifier">len</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">5</span>
    205. 

  205. 

  206. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">popFirst</span> <span class="Operator">==</span> <span class="DecNumber">10</span>
    207. 

  207. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">popLast</span> <span class="Operator">==</span> <span class="DecNumber">50</span>
    208. 

  208. <span class="Identifier">assert</span> <span class="Identifier">len</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">3</span>
    209. 

  209. 

  210. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addFirst</span><span class="Punctuation">(</span><span class="DecNumber">11</span><span class="Punctuation">)</span>
    211. 

  211. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addFirst</span><span class="Punctuation">(</span><span class="DecNumber">22</span><span class="Punctuation">)</span>
    212. 

  212. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addFirst</span><span class="Punctuation">(</span><span class="DecNumber">33</span><span class="Punctuation">)</span>
    213. 

  213. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[33, 22, 11, 20, 30, 40]&quot;</span>
    214. 

  214. 

  215. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">shrink</span><span class="Punctuation">(</span><span class="Identifier">fromFirst</span> <span class="Operator">=</span> <span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="Identifier">fromLast</span> <span class="Operator">=</span> <span class="DecNumber">2</span><span class="Punctuation">)</span>
    216. 

  216. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[22, 11, 20]&quot;</span></pre>
    217. 

  217. <h1><a class="toc-backref" id="see-also" href="#see-also">See also</a></h1><ul class="simple"><li><a class="reference external" href="lists.html">lists module</a> for singly and doubly linked lists and rings</li>
    218. 

  218. </ul>
    219. 

  219. </p>
    220. 

  220.     <div class="section" id="6">
    221. 

  221.   <h1><a class="toc-backref" href="#6">Imports</a></h1>
    222. 

  222.   <dl class="item">
    223. 

  223.     <a class="reference external" href="since.html">since</a>, <a class="reference external" href="assertions.html">assertions</a>, <a class="reference external" href="hashes.html">hashes</a>, <a class="reference external" href="math.html">math</a>
    224. 

  224.   </dl>
    225. 

  225. </div>
    226. 

  226. <div class="section" id="7">
    227. 

  227.   <h1><a class="toc-backref" href="#7">Types</a></h1>
    228. 

  228.   <dl class="item">
    229. 

  229.     <div id="Deque">
    230. 

  230.   <dt><pre><a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span> <span class="Other">=</span> <span class="Keyword">object</span></pre></dt>
    231. 

  231.   <dd>
    232. 

  232.     
    233. 

  233.     <p>A double-ended queue backed with a ringed <tt class="docutils literal"><span class="pre"><span class="Identifier">seq</span></span></tt> buffer.</p>
    234. 

  234. <p>To initialize an empty deque, use the <a class="reference external" href="#initDeque,int">initDeque proc</a>.</p>
    235. 

  235. 

  236.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L56" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    237. 

  237. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L56" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    238. 

  238. 

  239.   </dd>
    240. 

  240. </div>
    241. 

  241. 

  242.   </dl>
    243. 

  243. </div>
    244. 

  244. <div class="section" id="10">
    245. 

  245.   <h1><a class="toc-backref" href="#10">Consts</a></h1>
    246. 

  246.   <dl class="item">
    247. 

  247.     <div id="defaultInitialSize">
    248. 

  248.   <dt><pre><a href="deques.html#defaultInitialSize"><span class="Identifier">defaultInitialSize</span></a> <span class="Other">=</span> <span class="DecNumber">4</span></pre></dt>
    249. 

  249.   <dd>
    250. 

  250.     
    251. 

  251.     
    252. 

  252.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L72" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    253. 

  253. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L72" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    254. 

  254. 

  255.   </dd>
    256. 

  256. </div>
    257. 

  257. 

  258.   </dl>
    259. 

  259. </div>
    260. 

  260. <div class="section" id="12">
    261. 

  261.   <h1><a class="toc-backref" href="#12">Procs</a></h1>
    262. 

  262.   <dl class="item">
    263. 

  263.     <div id="$-procs-all">
    264. 

  264.   <div id="$,Deque[T]">
    265. 

  265.   <dt><pre><span class="Keyword">proc</span> <a href="#%24%2CDeque%5BT%5D"><span class="Identifier">`$`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#string"><span class="Identifier">string</span></a></pre></dt>
    266. 

  266.   <dd>
    267. 

  267.     
    268. 

  268.     Turns a deque into its string representation.
    269. 

  269. <p><strong class="examples_text">Example:</strong></p>
    270. 

  270. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    271. 

  271. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30]&quot;</span></pre>
    272. 

  272.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L444" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    273. 

  273. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L444" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    274. 

  274. 

  275.   </dd>
    276. 

  276. </div>
    277. 

  277. 

  278. </div>
    279. 

  279. <div id="==-procs-all">
    280. 

  280.   <div id="==,Deque[T],Deque[T]">
    281. 

  281.   <dt><pre><span class="Keyword">func</span> <a href="#%3D%3D%2CDeque%5BT%5D%2CDeque%5BT%5D"><span class="Identifier">`==`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq1</span><span class="Other">,</span> <span class="Identifier">deq2</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#bool"><span class="Identifier">bool</span></a></pre></dt>
    282. 

  282.   <dd>
    283. 

  283.     
    284. 

  284.     The <tt class="docutils literal"><span class="pre"><span class="Operator">==</span></span></tt> operator for Deque. Returns <tt class="docutils literal"><span class="pre"><span class="Identifier">true</span></span></tt> if both deques contains the same values in the same order.
    285. 

  285. <p><strong class="examples_text">Example:</strong></p>
    286. 

  286. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span><span class="Punctuation">,</span> <span class="Identifier">b</span> <span class="Operator">=</span> <span class="Identifier">initDeque</span><span class="Punctuation">[</span><span class="Identifier">int</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
    287. 

  287. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addFirst</span><span class="Punctuation">(</span><span class="DecNumber">2</span><span class="Punctuation">)</span>
    288. 

  288. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addFirst</span><span class="Punctuation">(</span><span class="DecNumber">1</span><span class="Punctuation">)</span>
    289. 

  289. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">addLast</span><span class="Punctuation">(</span><span class="DecNumber">1</span><span class="Punctuation">)</span>
    290. 

  290. <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">addLast</span><span class="Punctuation">(</span><span class="DecNumber">2</span><span class="Punctuation">)</span>
    291. 

  291. <span class="Identifier">doAssert</span> <span class="Identifier">a</span> <span class="Operator">==</span> <span class="Identifier">b</span></pre>
    292. 

  292.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L456" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    293. 

  293. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L456" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    294. 

  294. 

  295.   </dd>
    296. 

  296. </div>
    297. 

  297. 

  298. </div>
    299. 

  299. <div id="[]-procs-all">
    300. 

  300.   <div id="[],Deque[T],BackwardsIndex">
    301. 

  301.   <dt><pre><span class="Keyword">proc</span> <a href="#%5B%5D%2CDeque%5BT%5D%2CBackwardsIndex"><span class="Identifier">`[]`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">i</span><span class="Other">:</span> <a href="system.html#BackwardsIndex"><span class="Identifier">BackwardsIndex</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#lent"><span class="Identifier">lent</span></a> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    302. 

  302.   <dd>
    303. 

  303.     
    304. 

  304.     <p>Accesses the backwards indexed <tt class="docutils literal"><span class="pre"><span class="Identifier">i</span></span></tt>-th element.</p>
    305. 

  305. <p><tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span></span></tt> is the last element.</p>
    306. 

  306. 

  307. <p><strong class="examples_text">Example:</strong></p>
    308. 

  308. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    309. 

  309. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="DecNumber">50</span>
    310. 

  310. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">4</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="DecNumber">20</span>
    311. 

  311. <span class="Identifier">doAssertRaises</span><span class="Punctuation">(</span><span class="Identifier">IndexDefect</span><span class="Punctuation">,</span> <span class="Identifier">echo</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">9</span><span class="Punctuation">]</span><span class="Punctuation">)</span></pre>
    312. 

  312.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L152" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    313. 

  313. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L152" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    314. 

  314. 

  315.   </dd>
    316. 

  316. </div>
    317. 

  317. <div id="[],Deque[T],Natural">
    318. 

  318.   <dt><pre><span class="Keyword">proc</span> <a href="#%5B%5D%2CDeque%5BT%5D%2CNatural"><span class="Identifier">`[]`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">i</span><span class="Other">:</span> <a href="system.html#Natural"><span class="Identifier">Natural</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#lent"><span class="Identifier">lent</span></a> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    319. 

  319.   <dd>
    320. 

  320.     
    321. 

  321.     Accesses the <tt class="docutils literal"><span class="pre"><span class="Identifier">i</span></span></tt>-th element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.
    322. 

  322. <p><strong class="examples_text">Example:</strong></p>
    323. 

  323. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    324. 

  324. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="DecNumber">10</span>
    325. 

  325. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">3</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="DecNumber">40</span>
    326. 

  326. <span class="Identifier">doAssertRaises</span><span class="Punctuation">(</span><span class="Identifier">IndexDefect</span><span class="Punctuation">,</span> <span class="Identifier">echo</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">8</span><span class="Punctuation">]</span><span class="Punctuation">)</span></pre>
    327. 

  327.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L118" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    328. 

  328. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L118" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    329. 

  329. 

  330.   </dd>
    331. 

  331. </div>
    332. 

  332. <div id="[],Deque[T],BackwardsIndex_2">
    333. 

  333.   <dt><pre><span class="Keyword">proc</span> <a href="#%5B%5D%2CDeque%5BT%5D%2CBackwardsIndex_2"><span class="Identifier">`[]`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">i</span><span class="Other">:</span> <a href="system.html#BackwardsIndex"><span class="Identifier">BackwardsIndex</span></a><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    334. 

  334.   <dd>
    335. 

  335.     
    336. 

  336.     <p>Accesses the backwards indexed <tt class="docutils literal"><span class="pre"><span class="Identifier">i</span></span></tt>-th element and returns a mutable reference to it.</p>
    337. 

  337. <p><tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span></span></tt> is the last element.</p>
    338. 

  338. 

  339. <p><strong class="examples_text">Example:</strong></p>
    340. 

  340. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    341. 

  341. <span class="Identifier">inc</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span><span class="Punctuation">)</span>
    342. 

  342. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="DecNumber">51</span></pre>
    343. 

  343.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L165" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    344. 

  344. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L165" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    345. 

  345. 

  346.   </dd>
    347. 

  347. </div>
    348. 

  348. <div id="[],Deque[T],Natural_2">
    349. 

  349.   <dt><pre><span class="Keyword">proc</span> <a href="#%5B%5D%2CDeque%5BT%5D%2CNatural_2"><span class="Identifier">`[]`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">i</span><span class="Other">:</span> <a href="system.html#Natural"><span class="Identifier">Natural</span></a><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    350. 

  350.   <dd>
    351. 

  351.     
    352. 

  352.     Accesses the <tt class="docutils literal"><span class="pre"><span class="Identifier">i</span></span></tt>-th element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt> and returns a mutable reference to it.
    353. 

  353. <p><strong class="examples_text">Example:</strong></p>
    354. 

  354. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    355. 

  355. <span class="Identifier">inc</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">]</span><span class="Punctuation">)</span>
    356. 

  356. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">]</span> <span class="Operator">==</span> <span class="DecNumber">11</span></pre>
    357. 

  357.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L129" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    358. 

  358. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L129" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    359. 

  359. 

  360.   </dd>
    361. 

  361. </div>
    362. 

  362. 

  363. </div>
    364. 

  364. <div id="[]=-procs-all">
    365. 

  365.   <div id="[]=,Deque[T],BackwardsIndex,sinkT">
    366. 

  366.   <dt><pre><span class="Keyword">proc</span> <a href="#%5B%5D%3D%2CDeque%5BT%5D%2CBackwardsIndex%2CsinkT"><span class="Identifier">`[]=`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">i</span><span class="Other">:</span> <a href="system.html#BackwardsIndex"><span class="Identifier">BackwardsIndex</span></a><span class="Other">;</span> <span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#sink"><span class="Identifier">sink</span></a> <span class="Identifier">T</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    367. 

  367.   <dd>
    368. 

  368.     
    369. 

  369.     <p>Sets the backwards indexed <tt class="docutils literal"><span class="pre"><span class="Identifier">i</span></span></tt>-th element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt>.</p>
    370. 

  370. <p><tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span></span></tt> is the last element.</p>
    371. 

  371. 

  372. <p><strong class="examples_text">Example:</strong></p>
    373. 

  373. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    374. 

  374. <span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">1</span><span class="Punctuation">]</span> <span class="Operator">=</span> <span class="DecNumber">99</span>
    375. 

  375. <span class="Identifier">a</span><span class="Punctuation">[</span><span class="Operator">^</span><span class="DecNumber">3</span><span class="Punctuation">]</span> <span class="Operator">=</span> <span class="DecNumber">77</span>
    376. 

  376. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 77, 40, 99]&quot;</span></pre>
    377. 

  377.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L178" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    378. 

  378. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L178" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    379. 

  379. 

  380.   </dd>
    381. 

  381. </div>
    382. 

  382. <div id="[]=,Deque[T],Natural,sinkT">
    383. 

  383.   <dt><pre><span class="Keyword">proc</span> <a href="#%5B%5D%3D%2CDeque%5BT%5D%2CNatural%2CsinkT"><span class="Identifier">`[]=`</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">i</span><span class="Other">:</span> <a href="system.html#Natural"><span class="Identifier">Natural</span></a><span class="Other">;</span> <span class="Identifier">val</span><span class="Other">:</span> <a href="system.html#sink"><span class="Identifier">sink</span></a> <span class="Identifier">T</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    384. 

  384.   <dd>
    385. 

  385.     
    386. 

  386.     Sets the <tt class="docutils literal"><span class="pre"><span class="Identifier">i</span></span></tt>-th element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt> to <tt class="docutils literal"><span class="pre"><span class="Identifier">val</span></span></tt>.
    387. 

  387. <p><strong class="examples_text">Example:</strong></p>
    388. 

  388. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    389. 

  389. <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">0</span><span class="Punctuation">]</span> <span class="Operator">=</span> <span class="DecNumber">99</span>
    390. 

  390. <span class="Identifier">a</span><span class="Punctuation">[</span><span class="DecNumber">3</span><span class="Punctuation">]</span> <span class="Operator">=</span> <span class="DecNumber">66</span>
    391. 

  391. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[99, 20, 30, 66, 50]&quot;</span></pre>
    392. 

  392.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L140" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    393. 

  393. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L140" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    394. 

  394. 

  395.   </dd>
    396. 

  396. </div>
    397. 

  397. 

  398. </div>
    399. 

  399. <div id="addFirst-procs-all">
    400. 

  400.   <div id="addFirst,Deque[T],sinkT">
    401. 

  401.   <dt><pre><span class="Keyword">proc</span> <a href="#addFirst%2CDeque%5BT%5D%2CsinkT"><span class="Identifier">addFirst</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">item</span><span class="Other">:</span> <a href="system.html#sink"><span class="Identifier">sink</span></a> <span class="Identifier">T</span><span class="Other">)</span></pre></dt>
    402. 

  402.   <dd>
    403. 

  403.     
    404. 

  404.     <p>Adds an <tt class="docutils literal"><span class="pre"><span class="Identifier">item</span></span></tt> to the beginning of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.</p>
    405. 

  405. <p><strong>See also:</strong></p>
    406. 

  406. <ul class="simple"><li><a class="reference external" href="#addLast,Deque[T],sinkT">addLast proc</a></li>
    407. 

  407. </ul>
    408. 

  408. 

  409. <p><strong class="examples_text">Example:</strong></p>
    410. 

  410. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Identifier">initDeque</span><span class="Punctuation">[</span><span class="Identifier">int</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
    411. 

  411. <span class="Keyword">for</span> <span class="Identifier">i</span> <span class="Keyword">in</span> <span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">5</span><span class="Punctuation">:</span>
    412. 

  412.   <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addFirst</span><span class="Punctuation">(</span><span class="DecNumber">10</span> <span class="Operator">*</span> <span class="Identifier">i</span><span class="Punctuation">)</span>
    413. 

  413. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[50, 40, 30, 20, 10]&quot;</span></pre>
    414. 

  414.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L262" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    415. 

  415. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L262" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    416. 

  416. 

  417.   </dd>
    418. 

  418. </div>
    419. 

  419. 

  420. </div>
    421. 

  421. <div id="addLast-procs-all">
    422. 

  422.   <div id="addLast,Deque[T],sinkT">
    423. 

  423.   <dt><pre><span class="Keyword">proc</span> <a href="#addLast%2CDeque%5BT%5D%2CsinkT"><span class="Identifier">addLast</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">item</span><span class="Other">:</span> <a href="system.html#sink"><span class="Identifier">sink</span></a> <span class="Identifier">T</span><span class="Other">)</span></pre></dt>
    424. 

  424.   <dd>
    425. 

  425.     
    426. 

  426.     <p>Adds an <tt class="docutils literal"><span class="pre"><span class="Identifier">item</span></span></tt> to the end of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.</p>
    427. 

  427. <p><strong>See also:</strong></p>
    428. 

  428. <ul class="simple"><li><a class="reference external" href="#addFirst,Deque[T],sinkT">addFirst proc</a></li>
    429. 

  429. </ul>
    430. 

  430. 

  431. <p><strong class="examples_text">Example:</strong></p>
    432. 

  432. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Identifier">initDeque</span><span class="Punctuation">[</span><span class="Identifier">int</span><span class="Punctuation">]</span><span class="Punctuation">(</span><span class="Punctuation">)</span>
    433. 

  433. <span class="Keyword">for</span> <span class="Identifier">i</span> <span class="Keyword">in</span> <span class="DecNumber">1</span> <span class="Operator">..</span> <span class="DecNumber">5</span><span class="Punctuation">:</span>
    434. 

  434.   <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">addLast</span><span class="Punctuation">(</span><span class="DecNumber">10</span> <span class="Operator">*</span> <span class="Identifier">i</span><span class="Punctuation">)</span>
    435. 

  435. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span></pre>
    436. 

  436.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L277" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    437. 

  437. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L277" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    438. 

  438. 

  439.   </dd>
    440. 

  440. </div>
    441. 

  441. 

  442. </div>
    443. 

  443. <div id="clear-procs-all">
    444. 

  444.   <div id="clear,Deque[T]">
    445. 

  445.   <dt><pre><span class="Keyword">proc</span> <a href="#clear%2CDeque%5BT%5D"><span class="Identifier">clear</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    446. 

  446.   <dd>
    447. 

  447.     
    448. 

  448.     <p>Resets the deque so that it is empty.</p>
    449. 

  449. <p><strong>See also:</strong></p>
    450. 

  450. <ul class="simple"><li><a class="reference external" href="#shrink,Deque[T],int,int">shrink proc</a></li>
    451. 

  451. </ul>
    452. 

  452. 

  453. <p><strong class="examples_text">Example:</strong></p>
    454. 

  454. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    455. 

  455. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    456. 

  456. <span class="Identifier">clear</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span>
    457. 

  457. <span class="Identifier">assert</span> <span class="Identifier">len</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">0</span></pre>
    458. 

  458.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L401" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    459. 

  459. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L401" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    460. 

  460. 

  461.   </dd>
    462. 

  462. </div>
    463. 

  463. 

  464. </div>
    465. 

  465. <div id="contains-procs-all">
    466. 

  466.   <div id="contains,Deque[T],T">
    467. 

  467.   <dt><pre><span class="Keyword">proc</span> <a href="#contains%2CDeque%5BT%5D%2CT"><span class="Identifier">contains</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">item</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#bool"><span class="Identifier">bool</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    468. 

  468.   <dd>
    469. 

  469.     
    470. 

  470.     <p>Returns true if <tt class="docutils literal"><span class="pre"><span class="Identifier">item</span></span></tt> is in <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt> or false if not found.</p>
    471. 

  471. <p>Usually used via the <tt class="docutils literal"><span class="pre"><span class="Keyword">in</span></span></tt> operator. It is the equivalent of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span><span class="Operator">.</span><span class="Identifier">find</span><span class="Punctuation">(</span><span class="Identifier">item</span><span class="Punctuation">)</span> <span class="Operator">&gt;=</span> <span class="DecNumber">0</span></span></tt>.</p>
    472. 

  472. 

  473. <p><strong class="examples_text">Example:</strong></p>
    474. 

  474. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">q</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">7</span><span class="Punctuation">,</span> <span class="DecNumber">9</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    475. 

  475. <span class="Identifier">assert</span> <span class="DecNumber">7</span> <span class="Keyword">in</span> <span class="Identifier">q</span>
    476. 

  476. <span class="Identifier">assert</span> <span class="Identifier">q</span><span class="Operator">.</span><span class="Identifier">contains</span><span class="Punctuation">(</span><span class="DecNumber">7</span><span class="Punctuation">)</span>
    477. 

  477. <span class="Identifier">assert</span> <span class="DecNumber">8</span> <span class="Keyword">notin</span> <span class="Identifier">q</span></pre>
    478. 

  478.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L232" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    479. 

  479. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L232" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    480. 

  480. 

  481.   </dd>
    482. 

  482. </div>
    483. 

  483. 

  484. </div>
    485. 

  485. <div id="hash-procs-all">
    486. 

  486.   <div id="hash,Deque[T]">
    487. 

  487.   <dt><pre><span class="Keyword">func</span> <a href="#hash%2CDeque%5BT%5D"><span class="Identifier">hash</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="hashes.html#Hash"><span class="Identifier">Hash</span></a></pre></dt>
    488. 

  488.   <dd>
    489. 

  489.     
    490. 

  490.     Hashing of Deque.
    491. 

  491.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L476" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    492. 

  492. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L476" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    493. 

  493. 

  494.   </dd>
    495. 

  495. </div>
    496. 

  496. 

  497. </div>
    498. 

  498. <div id="initDeque-procs-all">
    499. 

  499.   <div id="initDeque,int">
    500. 

  500.   <dt><pre><span class="Keyword">proc</span> <a href="#initDeque%2Cint"><span class="Identifier">initDeque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">initialSize</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> <span class="Other">=</span> <span class="Identifier">defaultInitialSize</span><span class="Other">)</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span></pre></dt>
    501. 

  501.   <dd>
    502. 

  502.     
    503. 

  503.     <p>Creates a new empty deque.</p>
    504. 

  504. <p>Optionally, the initial capacity can be reserved via <tt class="docutils literal"><span class="pre"><span class="Identifier">initialSize</span></span></tt> as a performance optimization (default: <a class="reference external" href="#defaultInitialSize">defaultInitialSize</a>). The length of a newly created deque will still be 0.</p>
    505. 

  505. <p><strong>See also:</strong></p>
    506. 

  506. <ul class="simple"><li><a class="reference external" href="#toDeque,openArray[T]">toDeque proc</a></li>
    507. 

  507. </ul>
    508. 

  508. 

  509.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L85" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    510. 

  510. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L85" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    511. 

  511. 

  512.   </dd>
    513. 

  513. </div>
    514. 

  514. 

  515. </div>
    516. 

  516. <div id="len-procs-all">
    517. 

  517.   <div id="len,Deque[T]">
    518. 

  518.   <dt><pre><span class="Keyword">func</span> <a href="#len%2CDeque%5BT%5D"><span class="Identifier">len</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a> {.<span class="Identifier">inline</span>.}</pre></dt>
    519. 

  519.   <dd>
    520. 

  520.     
    521. 

  521.     Returns the number of elements of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.
    522. 

  522.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L98" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    523. 

  523. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L98" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    524. 

  524. 

  525.   </dd>
    526. 

  526. </div>
    527. 

  527. 

  528. </div>
    529. 

  529. <div id="peekFirst-procs-all">
    530. 

  530.   <div id="peekFirst,Deque[T]">
    531. 

  531.   <dt><pre><span class="Keyword">proc</span> <a href="#peekFirst%2CDeque%5BT%5D"><span class="Identifier">peekFirst</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#lent"><span class="Identifier">lent</span></a> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    532. 

  532.   <dd>
    533. 

  533.     
    534. 

  534.     <p>Returns the first element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>, but does not remove it from the deque.</p>
    535. 

  535. <p><strong>See also:</strong></p>
    536. 

  536. <ul class="simple"><li><a class="reference external" href="#peekFirst,Deque[T]_2">peekFirst proc</a> which returns a mutable reference</li>
    537. 

  537. <li><a class="reference external" href="#peekLast,Deque[T]">peekLast proc</a></li>
    538. 

  538. </ul>
    539. 

  539. 

  540. <p><strong class="examples_text">Example:</strong></p>
    541. 

  541. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    542. 

  542. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    543. 

  543. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">peekFirst</span> <span class="Operator">==</span> <span class="DecNumber">10</span>
    544. 

  544. <span class="Identifier">assert</span> <span class="Identifier">len</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">5</span></pre>
    545. 

  545.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L306" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    546. 

  546. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L306" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    547. 

  547. 

  548.   </dd>
    549. 

  549. </div>
    550. 

  550. <div id="peekFirst,Deque[T]_2">
    551. 

  551.   <dt><pre><span class="Keyword">proc</span> <a href="#peekFirst%2CDeque%5BT%5D_2"><span class="Identifier">peekFirst</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    552. 

  552.   <dd>
    553. 

  553.     
    554. 

  554.     <p>Returns a mutable reference to the first element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>, but does not remove it from the deque.</p>
    555. 

  555. <p><strong>See also:</strong></p>
    556. 

  556. <ul class="simple"><li><a class="reference external" href="#peekFirst,Deque[T]">peekFirst proc</a></li>
    557. 

  557. <li><a class="reference external" href="#peekLast,Deque[T]_2">peekLast proc</a></li>
    558. 

  558. </ul>
    559. 

  559. 

  560. <p><strong class="examples_text">Example:</strong></p>
    561. 

  561. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    562. 

  562. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">peekFirst</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Operator">=</span> <span class="DecNumber">99</span>
    563. 

  563. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[99, 20, 30, 40, 50]&quot;</span></pre>
    564. 

  564.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L336" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    565. 

  565. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L336" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    566. 

  566. 

  567.   </dd>
    568. 

  568. </div>
    569. 

  569. 

  570. </div>
    571. 

  571. <div id="peekLast-procs-all">
    572. 

  572.   <div id="peekLast,Deque[T]">
    573. 

  573.   <dt><pre><span class="Keyword">proc</span> <a href="#peekLast%2CDeque%5BT%5D"><span class="Identifier">peekLast</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#lent"><span class="Identifier">lent</span></a> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    574. 

  574.   <dd>
    575. 

  575.     
    576. 

  576.     <p>Returns the last element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>, but does not remove it from the deque.</p>
    577. 

  577. <p><strong>See also:</strong></p>
    578. 

  578. <ul class="simple"><li><a class="reference external" href="#peekLast,Deque[T]_2">peekLast proc</a> which returns a mutable reference</li>
    579. 

  579. <li><a class="reference external" href="#peekFirst,Deque[T]">peekFirst proc</a></li>
    580. 

  580. </ul>
    581. 

  581. 

  582. <p><strong class="examples_text">Example:</strong></p>
    583. 

  583. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    584. 

  584. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    585. 

  585. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">peekLast</span> <span class="Operator">==</span> <span class="DecNumber">50</span>
    586. 

  586. <span class="Identifier">assert</span> <span class="Identifier">len</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">5</span></pre>
    587. 

  587.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L321" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    588. 

  588. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L321" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    589. 

  589. 

  590.   </dd>
    591. 

  591. </div>
    592. 

  592. <div id="peekLast,Deque[T]_2">
    593. 

  593.   <dt><pre><span class="Keyword">proc</span> <a href="#peekLast%2CDeque%5BT%5D_2"><span class="Identifier">peekLast</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span>.}</pre></dt>
    594. 

  594.   <dd>
    595. 

  595.     
    596. 

  596.     <p>Returns a mutable reference to the last element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>, but does not remove it from the deque.</p>
    597. 

  597. <p><strong>See also:</strong></p>
    598. 

  598. <ul class="simple"><li><a class="reference external" href="#peekFirst,Deque[T]_2">peekFirst proc</a></li>
    599. 

  599. <li><a class="reference external" href="#peekLast,Deque[T]">peekLast proc</a></li>
    600. 

  600. </ul>
    601. 

  601. 

  602. <p><strong class="examples_text">Example:</strong></p>
    603. 

  603. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    604. 

  604. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">peekLast</span><span class="Punctuation">(</span><span class="Punctuation">)</span> <span class="Operator">=</span> <span class="DecNumber">99</span>
    605. 

  605. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 99]&quot;</span></pre>
    606. 

  606.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L351" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    607. 

  607. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L351" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    608. 

  608. 

  609.   </dd>
    610. 

  610. </div>
    611. 

  611. 

  612. </div>
    613. 

  613. <div id="popFirst-procs-all">
    614. 

  614.   <div id="popFirst,Deque[T]">
    615. 

  615.   <dt><pre><span class="Keyword">proc</span> <a href="#popFirst%2CDeque%5BT%5D"><span class="Identifier">popFirst</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span class="Identifier">discardable</span>.}</pre></dt>
    616. 

  616.   <dd>
    617. 

  617.     
    618. 

  618.     <p>Removes and returns the first element of the <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.</p>
    619. 

  619. <p>See also:</p>
    620. 

  620. <ul class="simple"><li><a class="reference external" href="#popLast,Deque[T]">popLast proc</a></li>
    621. 

  621. <li><a class="reference external" href="#shrink,Deque[T],int,int">shrink proc</a></li>
    622. 

  622. </ul>
    623. 

  623. 

  624. <p><strong class="examples_text">Example:</strong></p>
    625. 

  625. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    626. 

  626. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    627. 

  627. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">popFirst</span> <span class="Operator">==</span> <span class="DecNumber">10</span>
    628. 

  628. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[20, 30, 40, 50]&quot;</span></pre>
    629. 

  629.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L369" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    630. 

  630. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L369" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    631. 

  631. 

  632.   </dd>
    633. 

  633. </div>
    634. 

  634. 

  635. </div>
    636. 

  636. <div id="popLast-procs-all">
    637. 

  637.   <div id="popLast,Deque[T]">
    638. 

  638.   <dt><pre><span class="Keyword">proc</span> <a href="#popLast%2CDeque%5BT%5D"><span class="Identifier">popLast</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">T</span> {.<span class="Identifier">inline</span><span class="Other">,</span> <span class="Identifier">discardable</span>.}</pre></dt>
    639. 

  639.   <dd>
    640. 

  640.     
    641. 

  641.     <p>Removes and returns the last element of the <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.</p>
    642. 

  642. <p><strong>See also:</strong></p>
    643. 

  643. <ul class="simple"><li><a class="reference external" href="#popFirst,Deque[T]">popFirst proc</a></li>
    644. 

  644. <li><a class="reference external" href="#shrink,Deque[T],int,int">shrink proc</a></li>
    645. 

  645. </ul>
    646. 

  646. 

  647. <p><strong class="examples_text">Example:</strong></p>
    648. 

  648. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    649. 

  649. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    650. 

  650. <span class="Identifier">assert</span> <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">popLast</span> <span class="Operator">==</span> <span class="DecNumber">50</span>
    651. 

  651. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40]&quot;</span></pre>
    652. 

  652.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L385" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    653. 

  653. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L385" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    654. 

  654. 

  655.   </dd>
    656. 

  656. </div>
    657. 

  657. 

  658. </div>
    659. 

  659. <div id="shrink-procs-all">
    660. 

  660.   <div id="shrink,Deque[T],int,int">
    661. 

  661.   <dt><pre><span class="Keyword">proc</span> <a href="#shrink%2CDeque%5BT%5D%2Cint%2Cint"><span class="Identifier">shrink</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">;</span> <span class="Identifier">fromFirst</span> <span class="Other">=</span> <span class="DecNumber">0</span><span class="Other">;</span> <span class="Identifier">fromLast</span> <span class="Other">=</span> <span class="DecNumber">0</span><span class="Other">)</span></pre></dt>
    662. 

  662.   <dd>
    663. 

  663.     
    664. 

  664.     <p>Removes <tt class="docutils literal"><span class="pre"><span class="Identifier">fromFirst</span></span></tt> elements from the front of the deque and <tt class="docutils literal"><span class="pre"><span class="Identifier">fromLast</span></span></tt> elements from the back.</p>
    665. 

  665. <p>If the supplied number of elements exceeds the total number of elements in the deque, the deque will remain empty.</p>
    666. 

  666. <p><strong>See also:</strong></p>
    667. 

  667. <ul class="simple"><li><a class="reference external" href="#clear,Deque[T]">clear proc</a></li>
    668. 

  668. <li><a class="reference external" href="#popFirst,Deque[T]">popFirst proc</a></li>
    669. 

  669. <li><a class="reference external" href="#popLast,Deque[T]">popLast proc</a></li>
    670. 

  670. </ul>
    671. 

  671. 

  672. <p><strong class="examples_text">Example:</strong></p>
    673. 

  673. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    674. 

  674. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    675. 

  675. <span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">shrink</span><span class="Punctuation">(</span><span class="Identifier">fromFirst</span> <span class="Operator">=</span> <span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="Identifier">fromLast</span> <span class="Operator">=</span> <span class="DecNumber">1</span><span class="Punctuation">)</span>
    676. 

  676. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[30, 40]&quot;</span></pre>
    677. 

  677.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L415" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    678. 

  678. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L415" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    679. 

  679. 

  680.   </dd>
    681. 

  681. </div>
    682. 

  682. 

  683. </div>
    684. 

  684. <div id="toDeque-procs-all">
    685. 

  685.   <div id="toDeque,openArray[T]">
    686. 

  686.   <dt><pre><span class="Keyword">proc</span> <a href="#toDeque%2CopenArray%5BT%5D"><span class="Identifier">toDeque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#openArray"><span class="Identifier">openArray</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span></pre></dt>
    687. 

  687.   <dd>
    688. 

  688.     
    689. 

  689.     <p>Creates a new deque that contains the elements of <tt class="docutils literal"><span class="pre"><span class="Identifier">x</span></span></tt> (in the same order).</p>
    690. 

  690. <p><strong>See also:</strong></p>
    691. 

  691. <ul class="simple"><li><a class="reference external" href="#initDeque,int">initDeque proc</a></li>
    692. 

  692. </ul>
    693. 

  693. 

  694. <p><strong class="examples_text">Example:</strong></p>
    695. 

  695. <pre class="listing"><span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Identifier">toDeque</span><span class="Punctuation">(</span><span class="Punctuation">[</span><span class="DecNumber">7</span><span class="Punctuation">,</span> <span class="DecNumber">8</span><span class="Punctuation">,</span> <span class="DecNumber">9</span><span class="Punctuation">]</span><span class="Punctuation">)</span>
    696. 

  696. <span class="Identifier">assert</span> <span class="Identifier">len</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="DecNumber">3</span>
    697. 

  697. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[7, 8, 9]&quot;</span></pre>
    698. 

  698.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L292" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    699. 

  699. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L292" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    700. 

  700. 

  701.   </dd>
    702. 

  702. </div>
    703. 

  703. 

  704. </div>
    705. 

  705. 

  706.   </dl>
    707. 

  707. </div>
    708. 

  708. <div class="section" id="15">
    709. 

  709.   <h1><a class="toc-backref" href="#15">Iterators</a></h1>
    710. 

  710.   <dl class="item">
    711. 

  711.     <div id="items-iterators-all">
    712. 

  712.   <div id="items.i,Deque[T]">
    713. 

  713.   <dt><pre><span class="Keyword">iterator</span> <a href="#items.i%2CDeque%5BT%5D"><span class="Identifier">items</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <a href="system.html#lent"><span class="Identifier">lent</span></a> <span class="Identifier">T</span></pre></dt>
    714. 

  714.   <dd>
    715. 

  715.     
    716. 

  716.     <p>Yields every element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.</p>
    717. 

  717. <p><strong>See also:</strong></p>
    718. 

  718. <ul class="simple"><li><a class="reference external" href="#mitems.i,Deque[T]">mitems iterator</a></li>
    719. 

  719. </ul>
    720. 

  720. 

  721. <p><strong class="examples_text">Example:</strong></p>
    722. 

  722. <pre class="listing"><span class="Keyword">from</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">sequtils</span> <span class="Keyword">import</span> <span class="Identifier">toSeq</span>
    723. 

  723. 

  724. <span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    725. 

  725. <span class="Identifier">assert</span> <span class="Identifier">toSeq</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">items</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span></pre>
    726. 

  726.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L192" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    727. 

  727. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L192" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    728. 

  728. 

  729.   </dd>
    730. 

  730. </div>
    731. 

  731. 

  732. </div>
    733. 

  733. <div id="mitems-iterators-all">
    734. 

  734.   <div id="mitems.i,Deque[T]">
    735. 

  735.   <dt><pre><span class="Keyword">iterator</span> <a href="#mitems.i%2CDeque%5BT%5D"><span class="Identifier">mitems</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <span class="Keyword">var</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">var</span> <span class="Identifier">T</span></pre></dt>
    736. 

  736.   <dd>
    737. 

  737.     
    738. 

  738.     <p>Yields every element of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>, which can be modified.</p>
    739. 

  739. <p><strong>See also:</strong></p>
    740. 

  740. <ul class="simple"><li><a class="reference external" href="#items.i,Deque[T]">items iterator</a></li>
    741. 

  741. </ul>
    742. 

  742. 

  743. <p><strong class="examples_text">Example:</strong></p>
    744. 

  744. <pre class="listing"><span class="Keyword">var</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">,</span> <span class="DecNumber">40</span><span class="Punctuation">,</span> <span class="DecNumber">50</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    745. 

  745. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[10, 20, 30, 40, 50]&quot;</span>
    746. 

  746. <span class="Keyword">for</span> <span class="Identifier">x</span> <span class="Keyword">in</span> <span class="Identifier">mitems</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
    747. 

  747.   <span class="Identifier">x</span> <span class="Operator">=</span> <span class="DecNumber">5</span> <span class="Operator">*</span> <span class="Identifier">x</span> <span class="Operator">-</span> <span class="DecNumber">1</span>
    748. 

  748. <span class="Identifier">assert</span> <span class="Operator">$</span><span class="Identifier">a</span> <span class="Operator">==</span> <span class="StringLit">&quot;[49, 99, 149, 199, 249]&quot;</span></pre>
    749. 

  749.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L206" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    750. 

  750. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L206" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    751. 

  751. 

  752.   </dd>
    753. 

  753. </div>
    754. 

  754. 

  755. </div>
    756. 

  756. <div id="pairs-iterators-all">
    757. 

  757.   <div id="pairs.i,Deque[T]">
    758. 

  758.   <dt><pre><span class="Keyword">iterator</span> <a href="#pairs.i%2CDeque%5BT%5D"><span class="Identifier">pairs</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">(</span><span class="Identifier">deq</span><span class="Other">:</span> <a href="deques.html#Deque"><span class="Identifier">Deque</span></a><span class="Other">[</span><span class="Identifier">T</span><span class="Other">]</span><span class="Other">)</span><span class="Other">:</span> <span class="Keyword">tuple</span><span class="Other">[</span><span class="Identifier">key</span><span class="Other">:</span> <a href="system.html#int"><span class="Identifier">int</span></a><span class="Other">,</span> <span class="Identifier">val</span><span class="Other">:</span> <span class="Identifier">T</span><span class="Other">]</span></pre></dt>
    759. 

  759.   <dd>
    760. 

  760.     
    761. 

  761.     Yields every <tt class="docutils literal"><span class="pre"><span class="Punctuation">(</span><span class="Identifier">position</span><span class="Punctuation">,</span> <span class="Identifier">value</span><span class="Punctuation">)</span></span></tt>-pair of <tt class="docutils literal"><span class="pre"><span class="Identifier">deq</span></span></tt>.
    762. 

  762. <p><strong class="examples_text">Example:</strong></p>
    763. 

  763. <pre class="listing"><span class="Keyword">from</span> <span class="Identifier">std</span><span class="Operator">/</span><span class="Identifier">sequtils</span> <span class="Keyword">import</span> <span class="Identifier">toSeq</span>
    764. 

  764. 

  765. <span class="Keyword">let</span> <span class="Identifier">a</span> <span class="Operator">=</span> <span class="Punctuation">[</span><span class="DecNumber">10</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">]</span><span class="Operator">.</span><span class="Identifier">toDeque</span>
    766. 

  766. <span class="Identifier">assert</span> <span class="Identifier">toSeq</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Operator">.</span><span class="Identifier">pairs</span><span class="Punctuation">)</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="Punctuation">(</span><span class="DecNumber">0</span><span class="Punctuation">,</span> <span class="DecNumber">10</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Punctuation">(</span><span class="DecNumber">1</span><span class="Punctuation">,</span> <span class="DecNumber">20</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Punctuation">(</span><span class="DecNumber">2</span><span class="Punctuation">,</span> <span class="DecNumber">30</span><span class="Punctuation">)</span><span class="Punctuation">]</span></pre>
    767. 

  767.     <a href="https://github.com/nim-lang/Nim/tree/devel/lib/pure/collections/deques.nim#L221" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
    768. 

  768. <a href="https://github.com/nim-lang/Nim/edit/devel/lib/pure/collections/deques.nim#L221" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;
    769. 

  769. 

  770.   </dd>
    771. 

  771. </div>
    772. 

  772. 

  773. </div>
    774. 

  774. 

  775.   </dl>
    776. 

  776. </div>
    777. 

  777. 

  778.   </div>
    779. 

  779. </div>
    780. 

  780. 

  781.       <div class="twelve-columns footer">
    782. 

  782.         <span class="nim-sprite"></span>
    783. 

  783.         <br>
    784. 

  784.         <small style="color: var(--hint);">Made with Nim. Generated: 2025-01-09 12:00:22 UTC</small>
    785. 

  785.       </div>
    786. 

  786.     </div>
    787. 

  787.   </div>
    788. 

  788.       <script defer data-domain="nim-lang.org" src="https://plausible.io/js/plausible.js"></script>
    789. 

  789.     
    790. 

  790. </body>
    791. 

  791. </html>
    792. 

  792.