Explain the Error Name Values in JavaScript with examples.

Javascript Web Development Object Oriented Programming

The error name value is used for setting or returning the error name. The error name can return the below values.

Sl.No	Error Name & Description
1	EvalError It represents an error in the eval() function
2	RangeError It happens when a numeric value is out of its range
3	ReferenceError It happens when an illegal reference has occured
4	SyntaxError It represents a syntax error
5	TypeError It represents a type error
6	URIError It represents an error in the encodeURI().

Example

Following is the code for the error name values in JavaScript −

Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>Error name values in Javascript</h1>
<div style="color: green;" class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click on the above button to call a variable before it is defined
</h3>
<script>
   let resEle = document.querySelector(".result");
   document.querySelector(".Btn").addEventListener("click", () => {
      try {
         resEle.innerHTML = a;
      }
      catch (err) {
         resEle.innerHTML = "Error name = " + err.name;
      }
      let a = 44;
   });
</script>
</body>
</html>