Reverse the order of a SASS map.

map-reverse.scss

@function mapReverse ($map) {
    $result: null;

    @if type-of($map) == "map" {
        $keys: map-keys($map);
        $map-reversed: ();
        
        @for $i from length($keys) through 1 {
            $map-reversed: map-merge(
                $map-reversed,
                (nth($keys, $i): map-get($map, nth($keys, $i)))
            );
        }

        @if type-of($map-reversed) == "map" {
            $result: $map-reversed;
        } @else {
            @warn 'There was an error reversing the order of "#{$map}"';
        }
    } @else {
        @warn '"#{$map}" is not a valid map';
    }

    @return $result;
}