数据结构与算法JavaScript - 字典

键－值对

Object

Dictionay

function Dictionary() {
this.dataStore = new Array();
this.add = add;
this.find = find;
this.remove = remove;
this.showAll = showAll;
this.count = count;
this.clear = clear;
}

function add(key, value) {
this.dataStore[key] = value;
}

function find(key) {
return this.dataStore[key];
}

function remove(key) {
delete this.dataStore[key];
}

// Object.keys() 返回传入参数中存储的所有键
// 过滤所有的键并对其进行排序
function showAll() {
for(var key in Object.keys(this.dataStore).sort()) {
print(key + " ->" + this.dataStore[key]);
}
}
function count() {
var n = 0;
for(var key in Object.keys(this.dataStore)) {
++n;
}
return n;
}

function clear() {
for each (var key in Object.keys(this.dataStore)) {
delete this.dataStore[key];
}
}