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71 lines
2.2 KiB
Plaintext
71 lines
2.2 KiB
Plaintext
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---
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title: "@each"
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introduction: >
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The `@each` rule makes it easy to emit styles or evaluate code for each
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element of a [list](/documentation/values/lists) or each pair in a
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[map](/documentation/values/maps). It’s great for repetitive styles that only have a
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few variations between them. It’s usually written `@each <variable> in
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<expression> { ... }`, where the
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[expression](/documentation/syntax/structure#expressions) returns a list. The block is
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evaluated for each element of the list in turn, which is assigned to the given
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variable name.
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---
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{% render 'code-snippets/example-each-list' %}
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{% markdown %}
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## With Maps
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You can also use `@each` to iterate over every key/value pair in a map by
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writing it `@each <variable>, <variable> in <expression> { ... }`. The key is
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assigned to the first variable name, and the element is assigned to the second.
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{% endmarkdown %}
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{% render 'code-snippets/example-each-map' %}
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{% markdown %}
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## Destructuring
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If you have a list of lists, you can use `@each` to automatically assign
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variables to each of the values from the inner lists by writing it
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`@each <variable...> in <expression> { ... }`. This is known as *destructuring*,
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since the variables match the structure of the inner lists. Each variable name
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is assigned to the value at the corresponding position in the list, or
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[`null`][] if the list doesn't have enough values.
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[`null`]: /documentation/values/null
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{% endmarkdown %}
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{% codeExample 'each' %}
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$icons:
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"eye" "\f112" 12px,
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"start" "\f12e" 16px,
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"stop" "\f12f" 10px;
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@each $name, $glyph, $size in $icons {
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.icon-#{$name}:before {
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display: inline-block;
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font-family: "Icon Font";
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content: $glyph;
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font-size: $size;
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}
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}
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===
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$icons: "eye" "\f112" 12px, "start" "\f12e" 16px, "stop" "\f12f" 10px
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@each $name, $glyph, $size in $icons
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.icon-#{$name}:before
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display: inline-block
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font-family: "Icon Font"
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content: $glyph
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font-size: $size
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{% endcodeExample %}
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{% funFact %}
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Because `@each` supports destructuring and [maps count as lists of lists][],
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`@each`'s map support works without needing special support for maps in
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particular.
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[maps count as lists of lists]: /documentation/values/maps
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{% endfunFact %}
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