Iterating over arrays in Javascript - Mini Project: Build & Apply

Iterating over arrays

📖 Scenario: You are helping a small shop owner who keeps a list of daily sales amounts. They want to find out the total sales for the day by adding all the amounts together.

🎯 Goal: Build a simple JavaScript program that stores daily sales in an array, then uses a loop to add all sales amounts and finally prints the total sales.

📋 What You'll Learn

Create an array called dailySales with the exact values: 100, 200, 150, 50, 300

Create a variable called totalSales and set it to 0

Use a for loop with the variable sale to iterate over dailySales

Add each sale to totalSales inside the loop

Print the value of totalSales using console.log

💡 Why This Matters

🌍 Real World

Adding up daily sales is a common task in shops and businesses to track earnings.

💼 Career

Knowing how to loop through arrays and sum values is a basic skill for many programming jobs, especially in data processing and web development.

1

Create the sales array

Create an array called dailySales with these exact numbers: 100, 200, 150, 50, 300

Javascript

// Create the dailySales array with the given numbers
// Your code here

Need a hint?

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

2

Create the totalSales variable

Create a variable called totalSales and set it to 0

Javascript

const dailySales = [100, 200, 150, 50, 300];
// Create totalSales variable and set it to 0
// Your code here

Need a hint?

Use let to create a variable that can change later.

3

Add sales using a for loop

Use a for loop with the variable sale to go through each number in dailySales. Inside the loop, add each sale to totalSales

Javascript

const dailySales = [100, 200, 150, 50, 300];
let totalSales = 0;
// Use a for loop to add each sale to totalSales
// Your code here

Need a hint?

Use for (const sale of dailySales) to loop through the array.

4

Print the total sales

Print the value of totalSales using console.log

Javascript

const dailySales = [100, 200, 150, 50, 300];
let totalSales = 0;
for (const sale of dailySales) {
    totalSales += sale;
}
// Print totalSales
// Your code here

Need a hint?

Use console.log(totalSales); to show the total in the console.