A SCSS function computes and returns a single value, a number, a colour, a string, without emitting any CSS by itself, which makes it the tool for centralising every calculation in your stylesheets. This cheatsheet gathers the whole toolkit on one page, each snippet annotated line by line. Keep it open while you code, or save the image and pin it nearby.
For the full background, read the guide to SCSS functions. To practise, work through the 10 code-along examples.
Download the cheatsheet
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