What is === in javascript?

Answer 1

=== is the strict equal operator. It only returns a Boolean True if both the operands are equal and of the same type. If a is 2, and b is 4,

a === 2 (True)
b === 4 (True)
a === '2' (False)

vs True for all of the following,

a == 2 
a == "2"
2 == '2' 

Answer 2

please refer Strict Equality Check..

Answer 3

=== is 'strict equal operator'. It returns true if both the operands are equal AND are of same type.

a = 2
b = '2'
a == b //returns True
a === b //returns False

take a look at this tutorial