Question

Is there a small, lightweight solution for javascript class inheritance that will work well on both client and server side (node.js)? I’m not wanting a big library, just something that will allow me to declare a constructor and some methods, then have the ability for a class to inherit that.

Answer 1

John Resig outlines a simple inheritance framework in about 25 lines of code here. I have seen it used to good effect.

You can use it like this:

var Vehicle = Class.extend({
  init: function(wheels) {
    this.wheels = wheels;
  }
});

var Truck = Vehicle.extend({
  init: function(hp, wheels) {
    this.horsepower = hp;
    this._super(wheels);
  },

  printInfo: function() {
    console.log('I am a truck and I have ' + this.horsepower + ' hp.');
  }
});

var t = new Truck(4, 350);
t.printInfo();