Node.js built-in debugger in Node.js - Mini Project: Build & Apply

Using the Node.js Built-in Debugger

📖 Scenario: You are writing a simple Node.js program that calculates the sum of numbers in an array. You want to learn how to use the Node.js built-in debugger to inspect your code step-by-step.

🎯 Goal: Build a Node.js script with a function to sum numbers and set it up so you can debug it using the Node.js built-in debugger.

📋 What You'll Learn

Create an array of numbers called numbers with the values 10, 20, 30, 40, and 50.

Create a variable called total and set it to 0.

Write a for loop using for (const num of numbers) to add each number to total.

Add a debugger; statement inside the loop to pause execution for debugging.

💡 Why This Matters

🌍 Real World

Debugging is a key skill for fixing bugs and understanding how your Node.js code runs step-by-step.

💼 Career

Knowing how to use the Node.js built-in debugger helps developers troubleshoot issues efficiently in real projects.

1

Create the numbers array

Create an array called numbers with these exact values: 10, 20, 30, 40, and 50.

Node.js

// Create the numbers array
// Your code here

Need a hint?

Use square brackets [] to create an array and separate values with commas.

2

Initialize the total variable

Create a variable called total and set it to 0.

Node.js

const numbers = [10, 20, 30, 40, 50];
// Initialize total to 0
// Your code here

Need a hint?

Use let to declare a variable that will change.

3

Add a for loop to sum numbers

Write a for loop using for (const num of numbers) to add each number to total.

Node.js

const numbers = [10, 20, 30, 40, 50];
let total = 0;
// Add a for loop to sum numbers
// Your code here

Need a hint?

Use for (const num of numbers) to loop through each number.

4

Add debugger statement inside the loop

Add a debugger; statement inside the for loop to pause execution for debugging.

Node.js

const numbers = [10, 20, 30, 40, 50];
let total = 0;
for (const num of numbers) {
    // Add debugger statement here
    total += num;
}

Need a hint?

Place debugger; inside the loop block before adding to total.