For loop in Javascript - Mini Project: Build & Apply

Using a For Loop to Sum Numbers

📖 Scenario: You are helping a small shop owner who wants to add up the prices of some items they sold today.

🎯 Goal: Build a simple program that uses a for loop to add all the prices in a list and show the total amount earned.

📋 What You'll Learn

Create an array called prices with the exact values: 10, 20, 30, 40, 50

Create a variable called total and set it to 0

Use a for loop with the variable i to go through each item in prices

Add each price to the total inside the loop

Print the total after the loop finishes

💡 Why This Matters

🌍 Real World

Adding up prices is a common task in shopping apps, cash registers, and budgeting tools.

💼 Career

Understanding loops and arrays is essential for many programming jobs, especially in web development and data processing.

1

Create the prices array

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

Javascript

// Create the prices array with the numbers 10, 20, 30, 40, 50
// Your code here

Need a hint?

Use square brackets [] to make an array and separate numbers with commas.

2

Create the total variable

Create a variable called total and set it to 0.

Javascript

const prices = [10, 20, 30, 40, 50];
// Create a variable total and set it to 0
// Your code here

Need a hint?

Use let to create a variable that can change later.

3

Use a for loop to add prices

Use a for loop with the variable i to go through each item in prices. Inside the loop, add prices[i] to total.

Javascript

const prices = [10, 20, 30, 40, 50];
let total = 0;
// Use a for loop with i to add each price to total
// Your code here

Need a hint?

Start i at 0 and loop while it is less than prices.length. Add each price to total inside the loop.

4

Print the total

Write console.log(total) to print the total sum after the loop.

Javascript

const prices = [10, 20, 30, 40, 50];
let total = 0;
for (let i = 0; i < prices.length; i++) {
    total += prices[i];
}
// Print the total
// Your code here

Need a hint?

Use console.log(total) to show the result in the console.