mirror of
https://github.com/nim-lang/Nim.git
synced 2025-12-29 17:34:43 +00:00
34 lines
639 B
Nim
34 lines
639 B
Nim
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"]
|