javascript Dictionary类 字典

* Dictionary.js

/**
 * Created by Mch on 8/20/18.
 */
// var Set = require("./Set.js").Set;
function Dictionary() {
//     Set.call();
    this.items = {}
}
// Dictionary.prototype = new Set();

Dictionary.prototype.has = function(key) {
    return key in this.items;
};

Dictionary.prototype.set = function(key, value) {
    this.items[key] = value;
};

Dictionary.prototype.remove = function(key) {
    if (this.has(key)) {
        delete this.items[key];
        return true;
    }
    return false;
};

Dictionary.prototype.get = function(key) {
    return this.has(key) ? this.items[key] : undefined;
};

Dictionary.prototype.keys = function() {
    var keys = [];
    for (var k in this.items) {
        if (this.items.hasOwnProperty(k)) {
            keys.push(k);
        }
    }
    return keys;
};

Dictionary.prototype.values = function() {
    var values = [];
    for (var k in this.items) {
        if (this.items.hasOwnProperty(k)) {
            values.push(this.items[k]);
        }
    }
    return values;
};

Dictionary.prototype.getItems = function() {
    return this.items;
};

Dictionary.prototype.clear = function() {
    this.items = {}
};

Dictionary.prototype.size = function() {
    var count = 0;
    for (var prop in this.items) {
        if (this.items.hasOwnProperty(prop)) {
            ++count;
        }
    }
    return count;
};

exports.Dictionary = Dictionary;

* TestDictionary.js

/**
 * Created by Mch on 8/20/18.
 */
var Dictionary = require('./Dictionary.js').Dictionary;

function TestDictionary() {}

TestDictionary.main = function() {
    var dictionary = new Dictionary();
    dictionary.set('Gandalf', '[email protected]');
    dictionary.set('John', '[email protected]');
    dictionary.set('Tyrion', '[email protected]');

    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.keys());
    console.log(dictionary.values());
    console.log(dictionary.getItems());

};

TestDictionary.main();

$ node ./TestDictionary.js
true
3
[ 'Gandalf', 'John', 'Tyrion' ]
[ '[email protected]', '[email protected]', '[email protected]' ]
[email protected]
[ 'Gandalf', 'Tyrion' ]
[ '[email protected]', '[email protected]' ]
{ Gandalf: '[email protected]', Tyrion: '[email protected]' }