Private members in JavaScript

0 Private members in JavaScript.md

Private members in JavaScript

1-simple-closures.js

var secretHolder = (function () {
    var secret;
 
    return {
        getSecret: function () { return secret; },
        setSecret: function (newSecret) { secret = newSecret };
    }
}());
 
secretHolder.setSecret('ha-ha');
console.log(secretHolder.getSecret()); // prints ha-ha
console.log('secret' in secretHolder); // prints false

2-closures-with-classes.js

var User = (function () {
    var wrap = function (prefix, s, postfix) {
        if (!postfix) postfix = prefix;
        return prefix + s + postfix
    };
 
    function User(name, email) {
        this.name = name;
        this.email = email;
    }
 
    User.prototype.toString = function () {
        return wrap('"', this.name) + ' ' + wrap('<', this.email, '>');
    };
 
    return User;
}());
 
var user = new User('John Doe', '[email protected]');
console.log('' + user); // prints "John Doe" <[email protected]>
console.log('wrap' in user || 'wrap' in User); // prints false

3-commonjs-modules.js

// http://nodejs.org/api/modules.html
 
// -- user.js --
 
var wrap = function (prefix, s, postfix) {
    if (!postfix) postfix = prefix;
    return prefix + s + postfix
};
 
function User(name, email) {
    this.name = name;
    this.email = email;
}
 
User.prototype.toString = function () {
    return wrap('"', this.name) + ' ' + wrap('<', this.email, '>');
};
 
module.exports = User;
 
// -- app.js --
 
var User = require('./user.js');
 
var user = new User('John Doe', '[email protected]');
console.log('' + user); // prints "John Doe" <[email protected]>
console.log('wrap' in user || 'wrap' in User); // prints false

4-amd.js

// http://requirejs.org/docs/whyamd.html
 
// -- user.js --
 
define('user', function () {
    var wrap = function (prefix, s, postfix) {
        if (!postfix) postfix = prefix;
        return prefix + s + postfix
    };
 
    function User(name, email) {
        this.name = name;
        this.email = email;
    }
 
    User.prototype.toString = function () {
        return wrap('"', this.name) + ' ' + wrap('<', this.email, '>');
    };  
});
 
// -- app.js --
 
define('app', function (require) {
    var User = require('user');
 
    var user = new User('John Doe', '[email protected]');
    console.log('' + user); // prints "John Doe" <[email protected]>
    console.log('wrap' in user || 'wrap' in User); // prints false  
});