Why debugging skills matter in Node.js - See It in Action

Why debugging skills matter

📖 Scenario: You are building a simple Node.js script that processes a list of numbers to find which are even. Debugging skills help you find and fix mistakes in your code so it works correctly.

🎯 Goal: Create a Node.js script that holds a list of numbers, sets a threshold number, filters the list to keep only even numbers greater than the threshold, and finally exports the filtered list.

📋 What You'll Learn

Create an array called numbers with the values [2, 5, 8, 11, 14]

Create a variable called threshold and set it to 6

Use Array.filter() with a callback that keeps numbers greater than threshold and even

Export the filtered array as filteredNumbers

💡 Why This Matters

🌍 Real World

Filtering data based on conditions is common in real-world apps, like showing only available products or valid user inputs.

💼 Career

Debugging and filtering data are essential skills for Node.js developers working on backend services and APIs.

1

DATA SETUP: Create the numbers array

Create an array called numbers with these exact values: [2, 5, 8, 11, 14]

Node.js

// Create the array called numbers with the values [2, 5, 8, 11, 14]
// Your code here

Need a hint?

Use const numbers = [2, 5, 8, 11, 14]; to create the array.

2

CONFIGURATION: Set the threshold value

Create a variable called threshold and set it to the number 6

Node.js

const numbers = [2, 5, 8, 11, 14];
// Create a variable called threshold and set it to 6
// Your code here

Need a hint?

Use const threshold = 6; to set the threshold.

3

CORE LOGIC: Filter numbers greater than threshold and even

Create a variable called filteredNumbers that uses numbers.filter() with a callback function. The callback should keep numbers greater than threshold and that are even (divisible by 2).

Node.js

const numbers = [2, 5, 8, 11, 14];
const threshold = 6;
// Use numbers.filter() to create filteredNumbers with numbers > threshold and even
// Your code here

Need a hint?

Use numbers.filter(number => number > threshold && number % 2 === 0) to filter the array.

4

COMPLETION: Export the filtered numbers array

Add a line to export filteredNumbers using module.exports.

Node.js

const numbers = [2, 5, 8, 11, 14];
const threshold = 6;
const filteredNumbers = numbers.filter(number => number > threshold && number % 2 === 0);
// Export filteredNumbers using module.exports
// Your code here

Need a hint?

Use module.exports = { filteredNumbers }; to export the variable.