Loops in Nim are done either with a while statement or
with an iterator and for statement.
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A classic while loop, running until condition is false.
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var counter = 10
while counter > 0:
dec counter
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A for loop that iterates from 1 to 3 (inclusive).
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echo "Counting to three"
for i in 1..3:
echo i
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Two dots (..) are actually a shortcut for countup iterator.
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echo "Counting to three"
for i in countup(1, 3):
echo i
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Upper bound can also be excluded with ..<.
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echo "Counting to two"
for i in 1..<3:
echo i
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chars of a string can be iterated.
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for c in "abcd":
echo c
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echo "Odd numbers only"
for i in 1..10:
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An iteration can be skipped with a continue.
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if i mod 2 == 0:
continue
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Loops can be broken out of by using a break.
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if i >= 6:
break
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echo i |
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Loops cannot have an empty body. discard statement can be
used for such cases.
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for i in 1..10:
discard # an empty loop
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$ nim c -r loops.nim Counting to three 1 2 3 Counting to three 1 2 3 Counting to two 1 2 a b c d Odd numbers only 1 3 5 |
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