Creating pure Sass functions
Since Sass version 3.3.1., you can not only use the @mixin
directive, but also the @function
directive. Pure Sass functions created with the @function
directive do not generate output in the compiled CSS code, but return a single value. In this recipe, you will create a Sass function that converts value in px
(pixel) units to values in em
units.
Getting ready
Read the Installing Sass for command line usage recipe of Chapter 1, Getting Started with Sass, and install Ruby Sass on your system. In the Using Sass interactive mode and SassScript recipe of Chapter 1, Getting Started with Sass, you can read how to use the interactive Sass mode. Operations with units, as used in this recipe, can easily be tested in the interactive Sass mode.
How to do it...
Perform the steps below to build a pure Sass function yourself:
Create a Sass template that contains an
em
function, which looks as follows:$browser-context: 16; @function px_to_em($pixels, $context: $browser-context...