Course/Module 9/Topic 1 of 3Advanced

Error Handling & Debugging - Concepts

Explore the key concepts of error handling & debugging with practical examples and exercises.

45 min•By Priygop Team•Last updated: Feb 2026

Introduction to Error Handling & Debugging

In this section, we cover the fundamental aspects of error handling & debugging. You'll learn core concepts, see real-world examples, and understand how to apply them in your projects.

Key Concepts

Understanding the core principles of error handling & debugging
Practical applications and real-world use cases
Step-by-step implementation guides
Common patterns and best practices
Tips for debugging and troubleshooting
Performance optimization techniques

Error Handling & Debugging - Code Example

Example

// Custom Error Classes
class AppError extends Error {
  constructor(
    message: string,
    public code: string,
    public statusCode: number = 500
  ) {
    super(message);
    this.name = "AppError";
  }
}

class NotFoundError extends AppError {
  constructor(resource: string) {
    super(`${resource} not found`, "NOT_FOUND", 404);
  }
}

// Type Guards
function isAppError(error: unknown): error is AppError {
  return error instanceof AppError;
}

try {
  throw new NotFoundError("User");
} catch (e) {
  if (isAppError(e)) console.log(`Error ${e.code}: ${e.message}`);
}

Try It Yourself: Error Handling & Debugging

Try It Yourself: Error Handling & DebuggingJavaScript⚠ 1 error

⚠ Syntax Issues (1)

Line 1: JS Error: Unexpected identifier 'Result'

💡 Check syntax near the highlighted line.

JavaScript Editor

✕ 1 errorTab = 2 spaces

// Error handling patterns
type Result<T, E = Error> = { ok: true; value: T } | { ok: false; error: E };

function divide(a: number, b: number): Result<number, string> {
  if (b === 0) return { ok: false, error: "Division by zero" };
  return { ok: true, value: a / b };
}

const result = divide(10, 3);
if (result.ok) {
  console.log("Result:", result.value.toFixed(2));
} else {
  console.log("Error:", result.error);
}

const result2 = divide(10, 0);
console.log("Division by zero:", result2);

Result

Click ▶ Run to see the result

Edit the code on the left, then click Run

JavaScript|17 lines|496 chars|1 error, 0 warnings

UTF-8

Quick Quiz: Error Handling & Debugging

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