Chapter 4Functions and Mixins
If you are new to Sass, you’ve probably heard that it’s possible to create your own functions, as well as what’s known as mixins. Let’s start with what a function is before moving on to mixins.
In computer science, a function is a chunk of
code that returns a result, possibly accepting arguments. It’s an ideal
way to extract repeated pieces of code into a single reusable pattern. As
a consequence, functions exist in almost all programming languages, even
CSS! Think about it—when writing
rgba(..), we use CSS functions already. What’s
interesting is that Sass not only provides a lot of built-in functions, it
also provides authors with a way to define custom functions:
// Using the `darken(..)` ...