nth($list, $n)
Gets the nth item in a list.
Note that unlike some languages, the first item in a Sass list is number 1, the second number 2, and so forth.
This can return the nth pair in a map as well.
Negative index values address elements in reverse order, starting with the last element in the list.
Examples: nth(10px 20px 30px, 1) => 10px
nth((Helvetica, Arial, sans-serif), 3) => sans-serif
nth((width: 10px, length: 20px), 2) => length, 20px Parameters: $list (Base) $n