round($number) Rounds a number to the nearest whole number.

counter($args...) This function only exists as a workaround for IE7‘s

is_superselector($super, $sub) Returns whether $super is a superselector of $sub. This means that

map_remove($map, $keys...) Returns a new map with keys removed. Like all map functions,

inspect($value) Return a string containing the value as its Sass representation.

adjust_hue($color, $degrees) Changes the hue of a color. Takes a color and a number of degrees (usually between -360deg

map_has_key($map, $key) Returns whether a map has a value associated with a given key.

max($numbers...) Finds the maximum of several numbers. This function takes any number of arguments.

type_of($value) Returns the type of a value.

lighten($color, $amount) Makes a color lighter. Takes a color and a number between 0% and 100%