A SassScript list (usually referred to as just a list) is an ordered sequence of SassScript values. A list may or may not be bracketed, and a list has a separator which is one of "space", "comma", "slash", or "undecided". Only lists with zero or one elements may have an "undecided" separator.
A SassScript value's list value is the interpretation of that value as a SassScript list. This differs from type to type:
- The list value of a list is the list itself.
- The list value of a map is an unbracketed comma-separated list whose elements are the key/value pairs in the map as two-element unbracketed space-separated lists.
- The list value of any other value is an unbracketed undecided-separator list containing only that value.
An index is a unitless integer that refers to a specific location in a list. Positive integers count from the beginning of the list, and negative integers count from the end of the list. The referenced value is said to be indexed by the index. An integer is an invalid index for a given list if it's 0 or if its absolute value is larger than the length of that list.
For example, in the values in the list
["a", "b", "c"]are referred to by the following indices:
"a": 1, -3"b": 2, -2"c": 3, -1