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discard """
output: "XXXXX01234"
"""
iterator modPairs(a: var array[0..4,string]): tuple[key: int, val: var string] =
for i in 0..a.high:
yield (i, a[i])
iterator modItems*[T](a: var array[0..4,T]): var T =
for i in 0..a.high:
yield a[i]
var
arr = ["a", "b", "c", "d", "e"]
for a in modItems(arr):
a = "X"
for a in items(arr):
stdout.write(a)
for i, a in modPairs(arr):
a = $i
for a in items(arr):
stdout.write(a)
echo ""
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