What are the benefits of having a separate init function on objects?

Question

I mean code like this:

 function MyObject(x, y, z) {
     this.init(x, y, z);
 }
MyObject.prototype = {
    constructor: MyObject,
    init: function(x, y, z) {
        // actually use x, y, z
    },
    other methods
};

Why not just have an init method and do all the initialization in the constructor?

Answer 1

Missing. Really no. Your constructor function does nothing more than init. It is more or less antipattern.

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Answer 2

javascript, , , , . , :

function Person (name) {
    this.name = name;
}

function Accountant () {}

Accountant.prototype = new Person('');

, Accountant, :

var x = new Accountant();

, :

x.name = 'Andy';

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- , , , :

function new_person (name) {
    var self = {};
    self.name = name;
    return self;
}

function new_accountant (name) {
    var self = new_person(name);
    return self;
}

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, , - , init, , :

function Person (name) {
    this.init(name);
}

Person.prototype.init = function (name) {
    this.name = name;
}

function Accountant (name) {
    this.init(name);
}

Accountant.prototype = new Person('');

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