02-4-equality.md

2.4 Equality

Like other programming languages, Javascript supports a simple and easy way to check if two variables contain the same data.
We use the == operator to check if the LHS and the RHS are equal to each other. The output of the equality check is either true or false

var a = 10;
var x = 10;
console.log(a == x) // true
var p = 20;
console.log(p == x) // false

2.4.1 Strict and non-strict equality

Javascript can check for equality using == as well as === operator. The difference between the two is that the double-equals operator does a non-strict equality check. If the LHS or the RHS, can be cast to a different data type that is equal to the other side, the == operator would still return true. Whereas, the === operator will check for the LHS and the RHS to be of the same datatype **and **having the same value.

10 == '10'  // true
10 === '10' // false