Equality

var x=1; 
var y='1';  
if (x=y) { 
   console.log("Equals"); 
} else { 
   console.log("Not Equals"); 
} 

Double Equals ==

performs automatic type conversion

Triple Equals ===

this avoids behind the scenes type conversion

The '===' operator checks for explicit type conversion

null === undefined            // false 
false === 0;                  // false 
'' === 0;                     // false
123' === 123                  // false  

let num1 = 10; 
let num2 = 10; 
console.log( num1 == num2 );    // true 
console.log( num1 === num2 );   // true 

let num3 = new Number(10); 
let num4 = new Number(10); 
console.log( num3 == num4 );    // false 
console.log( num3 === num4 );   // false