atom.js
function (keyOrList, func) {
				var keys = toArray(keyOrList), i = -1, len = keys.length, key;
				while (++i < len) {
					key = keys[i];
					func(key, me.get(key));
				}
				return me;
			}
function (keyOrList, func) {
				var keys = toArray(keyOrList), i = -1, len = keys.length, key;
				while (++i < len) {
					key = keys[i];
					func(key, me.get(key));
				}
				return me;
			}
function ( keyOrList , func ) { var keys = toArray ( keyOrList ) , i = - 1 , len = keys . length , key ; while ( ++ i < len ) { key = keys [ i ] ; func ( key , me . get ( key ) ) ; } return me ; }
Call `func` on each of the specified keys.  The key is provided as the first arg, and the value as the second.
Call func on each of the specified keys . The key is provided as the first arg and the value as the second .