What’s the difference between “{}” and “[]” while declaring a JavaScript array?

Question

What’s the difference between “{}” and “[]” while declaring a JavaScript array? Normally I declare like

var a=[];

What is the meaning of de

Answer 1

Syntax of JSON

object = {} | { members }

• members = pair | pair, members
• pair = string : value

array = [] | [ elements ]

• elements = value | value elements

value = string|number|object|array|true|false|null