code: function ( obj, diff ) {
  		var result = [];
  
  		result = obj.filter( function ( i ) {
  			return !regex.null_undefined.test( i );
  		});
  
  		return !diff ? result : ( result.length < obj.length ? result : null );
  	}
docs: Compacts a Array by removing `null` or `undefined` indices
  
  @method compact
  @param  {Array} obj    Array to compact
  @param  {Boolean} diff Indicates to return resulting Array only if there's a difference
  @return {Array}        Compacted copy of `obj`, or null ( if `diff` is passed & no diff is found )