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49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
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---
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title: "@while"
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---
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The `@while` rule, written `@while <expression> { ... }`, evaluates its block if
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its [expression][] returns `true`. Then, if its expression still returns `true`,
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it evaluates its block again. This continues until the expression finally
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returns `false`.
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[expression]: ../syntax/structure#expressions
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<% example do %>
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/// Divides `$value` by `$ratio` until it's below `$base`.
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@function scale-below($value, $base, $ratio: 1.618) {
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@while $value > $base {
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$value: $value / $ratio;
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}
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@return $value;
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}
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$normal-font-size: 16px;
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sup {
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font-size: scale-below(20px, 16px);
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}
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===
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/// Divides `$value` by `$ratio` until it's below `$base`.
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@function scale-below($value, $base, $ratio: 1.618)
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@while $value > $base
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$value: $value / $ratio
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@return $value;
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$normal-font-size: 16px
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sup
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font-size: scale-below(20px, 16px)
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<% end %>
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<% heads_up do %>
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Although `@while` is necessary for a few particularly complex stylesheets, you're
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usually better of using either [`@each`][] or [`@for`][] if either of them will
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work. They're clearer for the reader, and often faster to compile as well.
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[`@each`]: each
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[`@for`]: for
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<% end %>
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<%= partial 'documentation/snippets/truthiness-and-falsiness' %>
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