rails-delegate

Delegation Pattern for JavaScript

This module implements the delegation pattern for JavaScript, in the very popular and usable Rails style.

delegate = require('rails-delegate');

function Car() {
  this.engine = new Engine();

  delegate('start', 'stop', 'cylinders', { from: this, to: this.engine });
};

myCar = new Car;

Now myCar.start() calls myCar.engine.start() and myCar.stop() calls myCar.engine.stop(). You can also access the property myCar.cylinders, which contains the value of myCar.engine.cylinders.

More information in the spec for delegating methods and properties. This library also provides meaningful error messages.

Alternatives

This library aims for maximally readable syntax that closely matches the Rails version. There are other libraries that are different and more versatile, for example node-delegates.