@for The @for directive repeatedly outputs a set of styles. For each repetition, a counter variable is used to adjust

hue($color) Returns the hue component of a color. See

unitless($number) Returns whether a number has units.

rgba($red, $green, $blue, $alpha) rgba($color, $alpha)

adjust_color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha]) Increases or decreases one

green($color) Gets the green component of a color. Calculated from HSL where necessary via

mix($color1, $color2, $weight:50%) Mixes two colors together. Specifically, takes the average of each of the RGB components

@while The @while directive takes a SassScript expression and repeatedly outputs the nested styles until the statement

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

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