JavaScript - Errors & Error Handling

Overview

Estimated time: 15–20 minutes

JavaScript provides mechanisms for handling errors and exceptions, allowing you to write robust code that can recover from unexpected situations.

Learning Objectives

• Understand different types of JavaScript errors.
• Use try...catch and throw for error handling.

Prerequisites

• JavaScript - Geolocation API

Types of Errors

• SyntaxError: Invalid code structure
• ReferenceError: Accessing undefined variables
• TypeError: Invalid operations on data types

Error Handling

try {
  // code that may throw
  throw new Error('Something went wrong');
} catch (e) {
  console.error(e.message);
}

Common Pitfalls

• Not all errors can be caught (e.g., syntax errors at parse time).

Summary

Proper error handling is essential for building reliable JavaScript applications.