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23 lines
747 B
Plaintext
23 lines
747 B
Plaintext
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---
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title: Flow Control Rules
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---
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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][] and [functions][] to write small algorithms to
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make writing your Sass easier.
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[mixins]: mixin
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[functions]: function
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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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