code: function ( array1, array2 ) {
  		var a = array1.length > array2.length ? array1 : array2,
  		    b = ( a === array1 ? array2 : array1 );
  
  		return a.filter( function ( key ) {
  			return array.contains( b, key );
  		});
  	}
docs: Finds the intersections between array1 and array2
  
  @method intersect
  @param  {Array} array1 Source Array
  @param  {Array} array2 Comparison Array
  @return {Array}        Array of the intersections