Automatically create object if undefined

Question

Is there an easy way to automatically add properties to objects if they don\'t allready exist?

Consider the following example:

var test = {}
test.hel         


        

Answer 1

var test = {}
test.hello.world = "Hello doesn't exist!"

This will throw an error obviously as you didn't defined the test.hello

Firstly you need to need define the hello key then inside you can assign any key. But if you want to create key if not exists then you can do following thing

test.hello = test.hello || {};

The above statement will create the test.hello object if not defined and if it is defined then it will assign the same value as it is previously

Now you can assign any new key inside the test.hello

test.hello.world = "Everything works perfect";

test.hello.world2 = 'With another key too, it works perfect';