How many data types are there in JS, and what are they?

Question

I started reading a book, Javascript for Kids. In it the author states that there are three data types:

• numbers
• strings
• booleans

Answer 1

You can test it using typeof operator:

The typeof operator gives you the names of data types when placed before any single operand.

Hence, try using typeof with any operand variable: it will give one of the following datatype names:

1. String
2. Number
3. Boolean
4. Object
5. Undefined

Hence, these are the five data Types in Javascript.

var val1 = "New World";   //returns String
var val2 = 5;             //returns Number
var val3 = true;          //returns Boolean
var val4 = [1,2,3];       //returns Object
var val5 = null;          //returns Object (Value is null, but type is still an object)
var val6;                 //returns Undefined