Data Types in JavaScript

Interviewer : Tell me all data types in JavaScript?

You: There are total 8 built in data types in JavaScript.

1. string
2. number
3. boolean
4. null
5. undefined
6. object
7. symbol ( ES6 feature)
8. bigInt

typeof Operator

JavaScripts Provides typeof operator to check the value and its type

var a;

typeof a; // undefined ( because there is no value in it)

a ='JS Snippets'
typeof a; // string

a=23;
typeof a; // number

a= undefined;
typeof a; // undefiend

a= true;
typeof a; // boolean

a= null;
typeof a; // object ( this is bug in JS, Google it to learn more about it)

a= {name:'Ashutosh'}
typeof a; // object