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Explain about logical not(!) operator in detail with example in javascript?

NOT operator

The logical NOT operator gives true for false values and false for true values.

Example

<html>
<body>
<p id="logical"></p>
<script>
   var x = 200;
   var y = 300;
   document.getElementById("logical").innerHTML =
   !(x < y) + "<br>" + !(x > y);
</script>
</body>
</html>

Output

false
true