2600 Programmers Guide by Wright S.

By Wright S.

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A mixin is a fragment of Sass that can easily be applied to another selector. Let’s say we require a distinct style: blue text with small caps. We need to apply this style to many selectors in our document. We don’t want to have to repeat color: #369; over and over again. This is the perfect situation for a mixin! To define a mixin, all you need to type is @mixin, followed by the name of the mixin and then its styling. Once we’ve defined it, we can easily use a mixin wherever we please—it’s a super-portable set of attributes.

But what if you had a set of attributes—say a blue button—that needed to be applied to multiple buttons with different functions? You want to name the buttons after their function, but it would be a pain typing out the set of attributes over and over again. This is where @extend comes in. @extend clones the attributes from one class or ID and adds them to another. Let’s run with the example we had with the blue button. Say we want to use the blue button style for the checkout button. blue_button class in the declaration of your selector.

Let’s say we have a background with the color #336699, and we want to make some text a little bit lighter (or a bit more saturated). We stab around in the dark until we find a suitable shade. Sass makes this conversion a lot easier with a few neat functions. We’ve got lighten and darken, saturate and desaturate, and there’s a whole bunch more in Appendix 1, SassScript Function Reference, on page 93. Just put the function before the color you wish to change. But this doesn’t just work for straightforward colors—we can also use it for color-based variables, darkening your $main_color, for example.

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