How do I setInterval with CoffeeScript?

Question

My JavaScript is as follows:

var util = require('util'); EventEmitter = require('events').EventEmitter;  var Ticker = function() {       var self = this;       setInterval( function() {         self.emit('tick');       }, 1000 );     } 

What's the equivalent CoffeeScript?

Answer 1

util = require 'util'  EventEmitter = require('events').EventEmitter  Ticker = ->   self = this   setInterval ->     self.emit 'tick'   , 1000   true 

You add the second parameter by lining up the comma with the function you are passing to, so it knows a second parameter is coming.

It also returns true instead of setInterval, although I can't personally see the advantage of not returning the setInterval.

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Here is a version with thick arrow (see comments), and destructuring assignment (see other comment). Also, returning the setInterval instead of explicitly returning true.

util = require 'util'  {EventEmitter} = require 'events'  Ticker = ->   setInterval =>     @emit 'tick'   , 1000