// throwError.js

// This file demonstrates how to manually throw

// and handle custom errors in JavaScript.

// Example 1: Throwing a simple error

function divideNumbers(a, b) {

if (b === 0) {

// Custom error message

throw new Error("Cannot divide by zero!");

}

return a / b;

}

// Using try-catch to handle the thrown error

try {

console.log(divideNumbers(10, 0)); // Throws an error

} catch (error) {

console.error("Error caught:", error.message);

}

// Example 2: Throwing a custom error type

class ValidationError extends Error {

constructor(message) {

super(message);

this.name = "ValidationError"; // Custom error name

}

}

function checkUsername(username) {

if (username.length < 4) {

throw new ValidationError("Username must be at least 4 characters long.");

}

return "Username is valid!";

}

try {

console.log(checkUsername("Tom")); // Too short

} catch (error) {

console.error(`${error.name}: ${error.message}`);

}

console.log("Program continues normally after handling errors.");