function Dictionary(){    var items = {};    this.has = function (key) {        return key in items;    };    this.set = function(key, value){        items[key] = value;    };    this.remove = function(key){        if (this.has(key)){            delete items[key];            return true;        }        return false;    };    this.get = function(key){        return this.has(key) ? items[key] : undefined;    };    this.values = function(){        var values = [];        for(var k in items){            if (this.has(k)) {                values.push(items[k]);            }        }        return values;    };    this.clear = function(){        items = {};    };    this.size = function(){        var count = 0;        for (var prop in items){            if(items.hasOwnProperty(prop)){                ++count;            }        }        return count;    };    this.getItems = function(){        return items;    };}var dictionary = new Dictionary();dictionary.set(‘Gandalf‘, ‘gandalf@email.com‘);dictionary.set(‘John‘, ‘johnsnow@email.com‘);dictionary.set(‘Tyrion‘, ‘tyrion@email.com‘);console.log(dictionary.has(‘Gandalf‘));console.log(dictionary.size());//console.log(dictionary.keys());console.log(dictionary.values());console.log(dictionary.get(‘Tyrion‘));dictionary.remove(‘John‘);console.log(dictionary.values());console.log(dictionary.get(‘Tyrion‘));