JavaScript collection

Question

Can anyone tell me what’s the difference between the below code implementations?

1. var a = [];

   a['b'] = 1;

2. var a = {};

   a['b'] = 1;

Answer 1

[] ----> It’s called the array literals. You can specify it like below 

var x = [] is short form for var x = new Array();

{} ----> It’s called object literals. Below is how you specify it:

var y = {} is short form for var y = new Object();

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