what is in javascript code example

Example 1: difference between == and === in 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

Example 2: js ===

5 =='5' // true: ignores type
5 === '5' // false: includes type

Example 3: === javascript

// ===	means equal value and equal type
var x = 5

// true
x === 5

// false
x === "5"

Example 4: js !==

var x = 5;

// === 	equal value and equal type
// e.g. 1. 
x === 5 returns true

// e.g. 2.
x === "5" returns false

// !== not equal value or not equal type
// e.g. 1.
x !== 5 returns false

// e.g. 2.
x !== "5" returns true

// e.g. 3.
x !== 8 returns true

Example 5: === 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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