Node.js Example of the `bind` method to chaining functions.

bind.js

// -----------------------------------------------------------------
//  Bind example
//  
//  Paul Jackson (pjackson@gmail.com)
//  http://blog.paulj.me/

// -----------------------------------------------------------------
//  Dependencies

var util = require('util')
  , EventEmitter = require('events').EventEmitter;

// -----------------------------------------------------------------
//  Worker Class

function Worker() {
  EventEmitter.call(this);
}
util.inherits(Worker, EventEmitter);

Worker.prototype.doWork = function (workItem) {
  this.emit('work', workItem);
}

// -----------------------------------------------------------------
//  Handler Class

function Handler() {
  EventEmitter.call(this);
}
util.inherits(Handler, EventEmitter);

Handler.prototype.process = function (workItem) {
  this.emit('processing', workItem);
}

// -----------------------------------------------------------------
//  Main

var worker  = new Worker();
var handler = new Handler();

// Wire up handler
handler.on('processing', function (item) {
  console.log('Processing: ', item);
});

// Chain the worker and the processor with BIND
worker.on('work', handler.process.bind(handler));

// Call the worker—Calling `doWork` here causes the
// `work` event to fire, which in turn, due to the
// `bind`, causes the `process` method to be called, 
// which finally emits its `processing` event, handled
// above—proxy in action.
worker.doWork('Hello world');