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25 lines
922 B
Markdown
25 lines
922 B
Markdown
---
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title: Flow Control Rules
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introduction: >
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Sass provides a number of at-rules that make it possible to control whether
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styles get emitted, or to emit them multiple times with small variations. They
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can also be used in [mixins](/documentation/at-rules/mixin) and
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[functions](/documentation/at-rules/function) to write small algorithms to
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make writing your Sass easier. Sass supports four flow control rules.
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---
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- [`@if`](/documentation/at-rules/control/if) controls whether or not a block is
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evaluated.
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- [`@each`](/documentation/at-rules/control/each) evaluates a block for each
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element in a [list][] or each pair in a [map][].
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- [`@for`](/documentation/at-rules/control/for) evaluates a block a certain
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number of times.
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- [`@while`](/documentation/at-rules/control/while) evaluates a block until a
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certain condition is met.
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[list]: /documentation/values/lists
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[map]: /documentation/values/maps
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