Quantity Queries Mixin for SASS

qq.scss

//While not complete this takes care of most quantity queries scenarios I have run into
/**
 * Quantity Queries
 * @param  {[int]} $amount   [Amount of elements needed for this to fire]
 * @param  {[type]} $q:'most' [Can have "most", "least" and "most-least"]
 * @return {[@content]}           [Returns the wrapped expression in a content query]
 * Usage: Embed into an element of choice wrapping the properties - compile
 */
 @mixin qq($amount, $max: 10, $q:'most', $elem: null){
// $elem: & !default;
//Setting the element to the parent... HOWEVER in some cases it will be nice to select it outside of parent,
//since the element could be nested and then the quantity query would fail...
	@if $elem != null {
		$elem: $elem;
	} @else {
		$elem: &;
	}

@if($q == 'most'){
   &:nth-last-child(-n+#{$amount}):first-child,
   &:nth-last-child(-n+#{$amount}):first-child ~ #{$elem}
   {
     @content;
   }
 } @else if ($q == 'least'){
   &:nth-last-child(n+#{$amount}),
   &:nth-last-child(n+#{$amount}) ~ #{$elem} {
     //#{$el}
     @content;
   }
 } @else if ($q == 'most-least'){
   &:nth-last-child(n+#{$amount}):nth-last-child(-n+#{$max}):first-child,
   &:nth-last-child(n+#{$amount}):nth-last-child(-n+#{$max}):first-child ~ #{$elem}
   {
     @content;
   }
 }
}