check-unit.scss

/**
 * Checking whether a number has the correct unit
 * @var $number [number] The number (with the unit) that you want to check against. E.g 35px
 * @var $unit   [string] The unit that you need to know exists. E.g 'px'
 * @return      [boolean]
 */
@function check-unit($number, $unit) {
	@if $number != '' and unit($number) == $unit {
		@return true;
	} @else {
		@return false;
	}
}