What are functions in SCSS?
Functions in SCSS are constructs that take arguments, perform calculations or transformations, and return a single value that can be inserted into any CSS property. Unlike mixins, functions do not generate a set of rules; they return a specific result: a number, color, string, length and so on.
Example of a custom function
scss
@function rem($px) {
@return $px / 16 * 1rem;
}
.title {
font-size: rem(32);
}Compilation result
css
.title {
font-size: 2rem;
}Where functions are useful
- size calculations: converting px to rem, computing widths, spacing, proportions;
- working with colors: lighter/darker, changing opacity and so on;
- building logic: forming values based on a condition.
Important: SCSS also has a ready set of built-in functions (for example, darken(), lighten(), mix(), percentage()), which remove the need for manual calculations.
Summary: functions in SCSS are a tool for calculations and generating values. They help get rid of routine calculations, make the code cleaner, and make the styles more flexible and mathematically precise.
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