code: function( map ) {
  					var code;
  					if ( map ) {
  						if ( completed ) {
  
  							// Execute the appropriate callbacks
  							jqXHR.always( map[ jqXHR.status ] );
  						} else {
  
  							// Lazy-add the new callbacks in a way that preserves old ones
  							for ( code in map ) {
  								statusCode[ code ] = [ statusCode[ code ], map[ code ] ];
  							}
  						}
  					}
  					return this;
  				}
docs: Status-dependent callbacks