javascript - Is events.EventEmitter.call(this) required when creating a custom EventEmitter? -

there lot of example not using events.eventemitter.call(this) in custom event emitter constructors, while other using (official documentation):

var events = require('events')   , util   = require('util');  var myemitter = function () {     events.eventemitter.call(this); };  util.inherits(myemitter, events.eventemitter);  myemitter.prototype.write = function () {     this.emit('tick'); }; 

with basic understandings of javascript don't know if need it. call necessary to initialization stuff inside eventemitter?

yes, is.

before node 0.10, wouldn't break if forget that.

now, it will:

the eventemitter constructor initializes various properties now. still works fine oop inheritance parent, have inheritance properly. broken-style js inheritance pattern not work when extending eventemitter class. inheritance style never supported, prior 0.10, did not break.