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      <h1 class="title">std/enumerate</h1>
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  <a class="reference reference-toplevel" href="#6" id="56">Imports</a>
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      <ul class="simple nested-toc-section">enumerate
  <li><a class="reference" href="#enumerate.m%2CForLoopStmt" title="enumerate(x: ForLoopStmt): untyped">enumerate(x: ForLoopStmt): untyped</a></li>

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    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/enumerate.nim#L1" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/enumerate.nim#L1" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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    <p class="module-desc">This module implements <tt class="docutils literal"><span class="pre"><span class="Identifier">enumerate</span></span></tt> syntactic sugar based on Nim's macro system.</p>
    <div class="section" id="6">
  <h1><a class="toc-backref" href="#6">Imports</a></h1>
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    <a class="reference external" href="since.html">since</a>, <a class="reference external" href="macros.html">macros</a>
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  <h1><a class="toc-backref" href="#17">Macros</a></h1>
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  <div id="enumerate.m,ForLoopStmt">
  <dt><pre><span class="Keyword">macro</span> <a href="#enumerate.m%2CForLoopStmt"><span class="Identifier">enumerate</span></a><span class="Other">(</span><span class="Identifier">x</span><span class="Other">:</span> <a href="system.html#ForLoopStmt"><span class="Identifier">ForLoopStmt</span></a><span class="Other">)</span><span class="Other">:</span> <a href="system.html#untyped"><span class="Identifier">untyped</span></a></pre></dt>
  <dd>
    
    <p>Enumerating iterator for collections.</p>
<p>It yields <tt class="docutils literal"><span class="pre"><span class="Punctuation">(</span><span class="Identifier">count</span><span class="Punctuation">,</span> <span class="Identifier">value</span><span class="Punctuation">)</span></span></tt> tuples (which must be immediately unpacked). The default starting count <tt class="docutils literal"><span class="pre"><span class="DecNumber">0</span></span></tt> can be manually overridden if needed.</p>

<p><strong class="examples_text">Example:</strong></p>
<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="Keyword">var</span> <span class="Identifier">b</span><span class="Punctuation">:</span> <span class="Identifier">seq</span><span class="Punctuation">[</span><span class="Punctuation">(</span><span class="Identifier">int</span><span class="Punctuation">,</span> <span class="Identifier">int</span><span class="Punctuation">)</span><span class="Punctuation">]</span> <span class="Operator">=</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="Punctuation">]</span>
<span class="Keyword">for</span> <span class="Identifier">i</span><span class="Punctuation">,</span> <span class="Identifier">x</span> <span class="Keyword">in</span> <span class="Identifier">enumerate</span><span class="Punctuation">(</span><span class="Identifier">a</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
  <span class="Identifier">b</span><span class="Operator">.</span><span class="Identifier">add</span><span class="Punctuation">(</span><span class="Punctuation">(</span><span class="Identifier">i</span><span class="Punctuation">,</span> <span class="Identifier">x</span><span class="Punctuation">)</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">b</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>

<span class="Keyword">let</span> <span class="Identifier">c</span> <span class="Operator">=</span> <span class="StringLit">&quot;abcd&quot;</span>
<span class="Keyword">var</span> <span class="Identifier">d</span><span class="Punctuation">:</span> <span class="Identifier">seq</span><span class="Punctuation">[</span><span class="Punctuation">(</span><span class="Identifier">int</span><span class="Punctuation">,</span> <span class="Identifier">char</span><span class="Punctuation">)</span><span class="Punctuation">]</span>
<span class="Keyword">for</span> <span class="Punctuation">(</span><span class="Identifier">i</span><span class="Punctuation">,</span> <span class="Identifier">x</span><span class="Punctuation">)</span> <span class="Keyword">in</span> <span class="Identifier">enumerate</span><span class="Punctuation">(</span><span class="DecNumber">97</span><span class="Punctuation">,</span> <span class="Identifier">c</span><span class="Punctuation">)</span><span class="Punctuation">:</span>
  <span class="Identifier">d</span><span class="Operator">.</span><span class="Identifier">add</span><span class="Punctuation">(</span><span class="Punctuation">(</span><span class="Identifier">i</span><span class="Punctuation">,</span> <span class="Identifier">x</span><span class="Punctuation">)</span><span class="Punctuation">)</span>
<span class="Identifier">assert</span> <span class="Identifier">d</span> <span class="Operator">==</span> <span class="Operator">@</span><span class="Punctuation">[</span><span class="Punctuation">(</span><span class="DecNumber">97</span><span class="Punctuation">,</span> <span class="CharLit">'a'</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Punctuation">(</span><span class="DecNumber">98</span><span class="Punctuation">,</span> <span class="CharLit">'b'</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Punctuation">(</span><span class="DecNumber">99</span><span class="Punctuation">,</span> <span class="CharLit">'c'</span><span class="Punctuation">)</span><span class="Punctuation">,</span> <span class="Punctuation">(</span><span class="DecNumber">100</span><span class="Punctuation">,</span> <span class="CharLit">'d'</span><span class="Punctuation">)</span><span class="Punctuation">]</span></pre>
    <a href="https://github.com/nim-lang/Nim/tree/devel/lib/std/enumerate.nim#L17" class="link-seesrc" target="_blank">Source</a>&nbsp;&nbsp;
<a href="https://github.com/nim-lang/Nim/edit/devel/lib/std/enumerate.nim#L17" class="link-seesrc" target="_blank" >Edit</a>&nbsp;&nbsp;

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