Pragmatic Guide to Sass 3

21	Using Lists to Work with Multiple Properties

Lists are used in many places in Sass. In fact, Sass treats most values and properties as lists by default. For example, in the declaration padding: 10px 20px 5px 5px;, Sass assumes that the pixel values are a list of four items. Lists are just a series of items that can be separated by a comma or a space. Lists can even consist of just one item. Some great use cases for lists are keeping multiple font selections together, or creating a collection of colors that you need for a style guide.

You can select items in a list by using the ​nth($list, $n)​ function. It takes two arguments: the list of items, followed by the index of the item in the list. In Sass, index counting starts at 1.

The example ...