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74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
---
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title: Functions
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---
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<% impl_status dart: true, libsass: '3.5.0', ruby: '3.5.0' do %>
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In older versions of LibSass and Ruby Sass, the [`call()` function][] took a
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string representing a function's name. This was changed to take a function value
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instead in preparation for a new module system where functions are no longer
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global and so a given name may not always refer to the same function.
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[`call()` function]: ../functions/meta#call
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<% end %>
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[Functions][] can be values too! You can't directly write a function as a value,
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but you can pass a function's name to the [`get-function()` function][] to get
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it as a value. Once you have a function value, you can pass it to the [`call()`
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function][] to call it. This is useful for writing *higher-order functions* that
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call other functions.
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[Functions]: ../at-rules/function
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[`get-function` function]: ../functions/meta#get-function
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[`call()` function]: ../functions/meta#call
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<%# TODO(nweiz): auto-generate this CSS once we're compiling with Dart Sass %>
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<% example do %>
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/// Return a copy of $list with all elements for which $condition returns `true`
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/// removed.
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@function remove-where($list, $condition) {
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$new-list: ();
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$separator: list-separator($list);
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@each $element in $list {
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@if not call($condition, $element) {
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$new-list: append($new-list, $element, $separator: $separator);
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}
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}
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@return $new-list;
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}
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$fonts: Tahoma, Geneva, "Helvetica Neue", Helvetica, Arial, sans-serif;
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content {
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@function contains-helvetica($string) {
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@return str-index($string, "Helvetica");
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}
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font-family: remove-where($fonts, get-function("contains-helvetica"));
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}
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===
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/// Return a copy of $list with all elements for which $condition returns `true`
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/// removed.
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@function remove-where($list, $condition)
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$new-list: ()
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$separator: list-separator($list)
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@each $element in $list
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@if not call($condition, $element)
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$new-list: append($new-list, $element, $separator: $separator)
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@return $new-list
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$fonts: Tahoma, Geneva, "Helvetica Neue", Helvetica, Arial, sans-serif
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content
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@function contains-helvetica($string)
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@return str-index($string, "Helvetica")
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font-family: remove-where($fonts, get-function("contains-helvetica"))
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===
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content {
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font-family: Tahoma, Geneva, Arial, sans-serif;
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}
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<% end %>
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