JavaScript Error name Property TypeError

Introduction

TypeError: A type error has occurred

You cannot convert a number to upper case:

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<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>

<script>
var num = 1;/*  www . j  a  va 2  s  . c om*/
try {
  num.toUpperCase();
}
catch(err) {
  document.getElementById("demo").innerHTML = err.name;
}
</script>

</body>
</html>



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