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44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
# `while` loops
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```
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let i = 0
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while (i < 10) do
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term.log(i)
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i += 1
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```
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A `while` loop with a truthy constant condition (e.g. a non-zero length) can be used to
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drain a collection:
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```
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import "random" expose random
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let x = []
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let i = 0
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while (i < 1e6) do
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x.append(i)
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i = i + 1
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let y = []
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while (x.length) do # loops while x.length is truthy (non-zero)
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let result = x.pop(random.int(0, x.length - 1))
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y.append(result)
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```
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(from [`array_pop.ar`](https://git.wbell.dev/Open-Argon/Chloride/src/commit/8e1ee06b88200ab112cf34e49efe969030ea435c/tests/array_pop.ar))
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## `while` as an expression-friendly loop
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`while` conditions are parenthesized expressions, so they can contain assignments,
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function calls, comparisons, etc. — anything that evaluates to a value.
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## Infinite loops
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There's no dedicated `loop` keyword; use `while (true) do ...` and `break` to exit (see
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[`break` and `continue`](../break-continue/README.md)). The test suite has a file named
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[`foreverloop.ar`](https://git.wbell.dev/Open-Argon/Chloride/src/commit/8e1ee06b88200ab112cf34e49efe969030ea435c/tests/foreverloop.ar) demonstrating this pattern.
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## Next
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- [`for` loops and iterators](../for/README.md) |