Try–catch block in Javascript - Mini Project: Build & Apply

Handling Errors with Try-Catch Block

📖 Scenario: Imagine you are building a simple calculator app that divides two numbers. Sometimes users might enter zero as the divisor, which causes an error. You want to handle this error gracefully.

🎯 Goal: You will create a program that tries to divide two numbers and uses a try-catch block to catch any errors, then display a friendly message.

📋 What You'll Learn

Create two variables called numerator and denominator with exact values 10 and 0

Create a variable called result and set it to null

Use a try block to divide numerator by denominator and assign to result

Use a catch block to catch any error and assign the string 'Cannot divide by zero' to result

Print the value of result

💡 Why This Matters

🌍 Real World

Try-catch blocks help apps avoid crashing when unexpected errors happen, like dividing by zero or reading missing files.

💼 Career

Understanding error handling is essential for writing reliable code in any software development job.

1

Create the numbers to divide

Create two variables called numerator and denominator with values 10 and 0 respectively.

Javascript

# Your code here

Need a hint?

Use const to create variables and assign the exact numbers.

2

Create a variable to hold the result

Create a variable called result and set it to null.

Javascript

const numerator = 10;
const denominator = 0;
# Your code here

Need a hint?

Use let because result will change later.

3

Use try-catch to divide safely

Use a try block to divide numerator by denominator and assign it to result. Use a catch block to catch any error and assign the string 'Cannot divide by zero' to result.

Javascript

const numerator = 10;
const denominator = 0;
let result = null;
# Your code here

Need a hint?

Throw an error manually if denominator is zero, then catch it to set result.

4

Print the result

Write console.log(result) to display the value of result.

Javascript

const numerator = 10;
const denominator = 0;
let result = null;

try {
    if (denominator === 0) {
        throw new Error('Divide by zero');
    }
    result = numerator / denominator;
} catch (error) {
    result = 'Cannot divide by zero';
}
# Your code here

Need a hint?

Use console.log(result) to print the final message.