quote($string) Add quotes to a string if the string isn’t quoted, or returns the same string if it is. Examples: quote("foo") => "foo" quote(foo) => "foo" Parameters: $string (String) Returns: (String) Raises: (ArgumentError) — if $string isn’t a string

append($list, $val, $separator:auto) Appends a single value onto the end of a list. Unless the $separator argument is passed, if the list had only one item, the resulting list will be space-separated. Like all list functions, append() returns a new list rather than modifying its argument in place. Examples: append(10px 20px, 30px) => 10px 20px 30px append((blue, red), green) => blue, red, green append(10px 20px, 30px 40px) => 10px 20px (30px 40px) append(10px, 20px, comma) => 10