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22 lines
884 B
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22 lines
884 B
Plaintext
## Truthiness and Falsiness
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Anywhere `true` or `false` are allowed, you can use other values as well. The
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values `false` and [`null`][] are *falsey*, which means Sass considers them to
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indicate falsehood and cause conditions to fail. Every other value is considered
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*truthy*, so Sass considers them to work like `true` and cause conditions to
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succeed.
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[`null`]: /documentation/values/null
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For example, if you want to check if a string contains a space, you can just
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write `string.index($string, " ")`. The [`string.index()` function][] returns
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`null` if the string isn't found and a number otherwise.
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[`string.index()` function]: /documentation/modules/string#index
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<% heads_up do %>
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Some languages consider more values falsey than just `false` and `null`. Sass
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isn't one of those languages! Empty strings, empty lists, and the number `0`
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are all truthy in Sass.
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<% end %>
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