Array length property in Javascript - Mini Project: Build & Apply

Understanding the Array length Property in JavaScript

📖 Scenario: You are helping a small online store keep track of the items in their shopping cart. Each item is stored in an array. You want to find out how many items are currently in the cart.

🎯 Goal: Build a simple program that creates an array of items, then uses the length property to find out how many items are in the array, and finally prints that number.

📋 What You'll Learn

Create an array called cartItems with exactly these items: 'apple', 'banana', 'orange'

Create a variable called numberOfItems that stores the length of the cartItems array

Print the value of numberOfItems to the console

💡 Why This Matters

🌍 Real World

Arrays are used everywhere in programming to store lists of things like shopping cart items, user names, or messages.

💼 Career

Knowing how to use arrays and their properties like <code>length</code> is a basic skill for any JavaScript developer.

1

Create the cartItems array

Create an array called cartItems with these exact items: 'apple', 'banana', 'orange'

Javascript

// Create the cartItems array with 'apple', 'banana', and 'orange'
// Your code here

Need a hint?

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

2

Create the numberOfItems variable

Create a variable called numberOfItems and set it to the length of the cartItems array using the length property

Javascript

const cartItems = ['apple', 'banana', 'orange'];
// Create numberOfItems and set it to cartItems.length
// Your code here

Need a hint?

Use arrayName.length to get the number of items in an array.

3

Print the number of items

Use console.log to print the value of numberOfItems to the console

Javascript

const cartItems = ['apple', 'banana', 'orange'];
const numberOfItems = cartItems.length;
// Print numberOfItems to the console
// Your code here

Need a hint?

Use console.log(variableName) to show the value in the console.

4

Run and check the output

Run the program and check that the output is 3, which is the number of items in the cartItems array

Javascript

const cartItems = ['apple', 'banana', 'orange'];
const numberOfItems = cartItems.length;
console.log(numberOfItems);
// Run the code and check the output

Need a hint?

The console should show the number 3 because there are three items in the array.