Question

I’ve seen many javascript objects that have a ‘init’ method that you pass in values to in order to setup the object.

How do they internally handle the initializations of their private variables when passed in a array of name/value pairs like:

myObject.init( {prop1: ‘blah’, prop2: ‘asdf’, …, propn: ‘n’} );

Specifically, some of these values can be optional, so how would you setup defaults and then override them if the name/value pair was passed in during the init.

Answer 1

var myObject = {   init: function(options) {     this.foo = options.foo || 'some default';     this.bar = options.requiredArg;      if (!this.bar) raiseSomeError();   } }