Listing the cart

Write the function that prints the cart formatted.

Listing the cart

To print the items in the cart, use a for loop. Each item is a Product; its fields are accessed with item.name and item.price.

for (item in cart) {
    println("${item.name}: ${item.price}")
}
// Apple: 5.0
// Bread: 3.0

Each loop step, item represents one product. The template ${item.name} embeds the name, ${item.price} the price.

This format is handy for showing the cart to the user.

Exercise List the items

Add a for (item in cart) { println("${item.name}: ${item.price}") } loop to the previous cart (two items + total). Each item should be on its own line: "Apple: 5.0" and "Bread: 3.0".

Show example solution

data class Product(val name: String, val price: Double)

fun main() {
    val cart = mutableListOf<Product>()
    cart.add(Product("Apple", 5.0))
    cart.add(Product("Bread", 3.0))
    val total = cart.sumOf { it.price }
    for (item in cart) {
        println("${item.name}: ${item.price}")
    }
}

Formatted output

To make the output more readable, templates and formatting are used. ${item.name}: ${item.price} shows each item on one line.

// Output:
// Apple: 5.0
// Bread: 3.0

A colon and space separate the name and price. Without templates you'd write item.name + ": " + item.price; templates are shorter.

Each item is on its own line; println adds the line break automatically.

Test yourself

What is used to print every item in the cart?
- if statement
- for loop
- when statement
- println alone
Show answer

for loop — A for loop visits each item in the list in turn.

Complete the for loop

for (____ in cart) { println("${item.name}: ${item.price}") }

Show answer

for (item in cart) { println("${item.name}: ${item.price}") }

Match the listing concepts

for (item in cart)

List loop
item.name

Item name
item.price

Item price
${item.name}

Template

Next lesson: Putting it together

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies