In browser, window is the global object. All variables and functions defined inside
script become members of the window object in browser. In Nodejs environment,
variables in the script are scoped to module only.
Built in Objects
There are several built in objects as mentioned below.
Date - used to work with dates
RegEx - used to work with regular expressions
Math - This object provides mathematical functions
JSON - This object provides functions to work with JSON data
JSON object
This object provides 2 methods - parse and stringify.
JSON is a object. It is not a function. So we can not call it directly.
But we can definitely access it's properties and methods.
Date object
Date is a function and as you know, functions are first class objects in JavaScript.
This means that we can call Date function.
e.g. Date() - returns the current date and time.