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- discard """
- output: '''true
- true'''
- """
- import sequtils
- var x = @[1, 2, 3]
- # This mapIt call will run with preallocation because ``len`` is available.
- var y = x.mapIt($(it+10))
- echo y == @["11", "12", "13"]
- type structureWithoutLen = object
- a: array[5, int]
- iterator items(s: structureWithoutLen): int {.inline.} =
- yield s.a[0]
- yield s.a[1]
- yield s.a[2]
- yield s.a[3]
- yield s.a[4]
- var st: structureWithoutLen
- st.a[0] = 0
- st.a[1] = 1
- st.a[2] = 2
- st.a[3] = 3
- st.a[4] = 4
- # this will run without preallocating the result
- # since ``len`` is not available
- var r = st.mapIt($(it+10))
- echo r == @["10", "11", "12", "13", "14"]
|
