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in and notin

Nim also has the in operator and it works similarly to Python.

Subtle difference: the negation of in in Python is not in (2 words), while in Nim it's notin (just 1 word).

in and notin
li = [5, 2, 8]

print(2 in li)         # True

print(99 not in li)    # True
let li = @[5, 2, 8]

echo 2 in li           # true

echo 99 notin li       # true

# echo 99 not in li    # ERROR
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Page last modified on 2026 April 08, 23:28