=== in js

JavaScript
0 == false   // true
0 === false  // false, because they are of a different type
1 == "1"     // true, automatic type conversion for value only
1 === "1"    // false, because they are of a different type
null == undefined // true
null === undefined // false
'0' == false // true
'0' === false // false// ===	means equal value and equal type
var x = 5

// true
x === 5

// false
x === "5"5 =='5' // true: ignores type
5 === '5' // false: includes type<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>

  var x = abc;
  document.getElementById("demo").innerHTML = (x === "ABC");

</script>

</body>
</html>
x = x || 1
Source