04_ee.js

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

var emitter = new EventEmitter;

var tick = true;
var count = 0;

setInterval(function() {
  count ++;
  if (tick) emitter.emit('tic', count);
  else emitter.emit('tac', count);
  tick = !tick;
}, 1000);

emitter.on('tic', function(count) {
  console.log('[%d] TIC', count);
});

emitter.on('tac', function(count) {
  console.log('[%d] TAC', count);
});

function listener (event, count) {
  console.log('listener', event, 'got', count, 'this =', this)
}

emitter.on('tic', function (count) {
  //listener('tic', count)
})

var a

emitter.on('tic', a = listener.bind({ s: 'my new "THIS!"' }, 'tic'))