2018-09-01 22:35:20 +02:00
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---
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title: Flow Control Rules
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2019-03-05 01:24:31 +01:00
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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](mixin) and [functions](function) to write small
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algorithms to make writing your Sass easier.
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2018-09-01 22:35:20 +02:00
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---
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Sass supports four flow control rules:
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* [`@if`](control/if) controls whether or not a block is evaluated.
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* [`@each`](control/each) evaluates a block for each element in a [list][] or
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each pair in a [map][].
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* [`@for`](control/for) evaluates a block a certain number of times.
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* [`@while`](control/while) evaluates a block until a certain condition is met.
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[list]: ../values/lists
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[map]: ../values/maps
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