Question

Suppose I have a constructor:

function Constructor(input) {
  this.input = input
}

Constructor.prototype.method = function() {
  console.log('a')
}

But I want to make another class using a copy of the constructor, but changing the prototypes.

function Constructor2(input) {
  this.input = input
}

Constructor2.prototype.method = function() {
  console.log('b')
}

I don’t want to redefine the constructor. How would you do this? Ideally it would be something as simple as:

var Constructor2 = inherits(Constructor)
Constructor2.prototype.method = // overwrite the inherited `method()`

Answer 1

var inherits = function(childCtor, parentCtor) {
  /** @constructor */
  function tempCtor() {};
  tempCtor.prototype = parentCtor.prototype;
  childCtor.superClass_ = parentCtor.prototype;
  childCtor.prototype = new tempCtor();
  /** @override */
  childCtor.prototype.constructor = childCtor;
};



// How to use it:

var Constructor1 = function() {
//add all your methods, variables etc
};

Constructor1.prototype.myMethod = function() {
};

var Contructor2 = function() {
Contructor1.call(this); // Call the super class constructor
};
inherits(Contstructor2, Constructor1);
// Constructor2 now inherits from Constructor1
// override, add methods variables etc, whatever you need.

// Have fun!