Simple javascript key/value cache

keyValueCache.js

/*

 cache.set(<key>, <value>)
 cache.set({ <key1> : <value1>, <keyN> : <valueN> });
 cache.get(<key>, <optional|defaultvalue>) => <value>
 
 Example:
  cache.set({ foo : 'bar' });
  cache.get('foo'); //'bar'

*/
var cache = (function () {
    var _internalCache = {};

    return {
        
        get: function (key, defaultValue) {
            return _internalCache[key] || defaultValue;
        },
        set: function (key, value) {
            if (typeof key === 'object') {
                for (var k in key) {
                    _internalCache[k] = key[k];
                }
                
                return;
            }
            
            key && (_internalCache[key] = value);
        }
    };

})();