+ vs += in javascript code example

Example 1: difference between == and ===

var a = 23;
var b = "23";

a == b // true (Equalit without type check)

a === b // false (Equality with type check)

Example 2: === in js

<!DOCTYPE html>
<html>
<body>

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

<script>

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

</script>

</body>
</html>

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