osh-class

Class

Yet another wrapper for creating classes in js.

Installation

npm install osh-class

Example usage

var Class = require('osh-class');
 
// Pass in a prototype object.
var Boat = Class({
  constructor: function(opts) {
    // Do stuff with opts object here.
    this.opts = opts;
  },
 
  start: function() {
    if (!this.opts.fuel) {
      throw new Error('Put fuel in it.');
    }
    this._running = true;
  }
});
 
 
// Or add non-constructor methods to prototype one-by-one.
Boat.prototype.stop = function() {
  this._running = false;
};
 
// You don't have to use new Boat(), but can if you want
var boat = Boat();
 
// Subclass Boat
var Canoe = Class(Boat, {
  constructor: function() {
    this._super({fuel: true});
  }
});
 
// Or like so,
var QueenMary = Boat.extend({
  constructor: function() {
    this._super({fuel: false});
  }
});

Documentation

Signature:

Class([Function super,] Object prototype)

The Class function takes 1 or 2 arguments. One of them is always a prototype for your class. If 2 arguments are given, the former is the super class and should be the result of a previous call to Class.

A Class constructor is equipped with a this._super(opts) method,

var A = Class({
  constructor: function(value) {this.value = value;}
});
var B = Class(A, {
  constructor: function() {this._super(1);}
});
 
var b = B();
console.log(b.value); // 1

If an explicit constructor function is not specified on a subclass, the constructor of the superclass will be used. For example,

var A = Class({
  constructor: function(value) {this.value = value;}
});
var B = Class(A, {});
 
var b = B(1);
console.log(b.value); // 1

License

MIT