Steps

1. How to create a case class to represent Donut objects

In the Learn how to define and use case class tutorial, we showed how to represent objects in Scala using case classes. Similarly, in the code below, we will use a case class to represent an object of type Donut.

println("\nStep 1: How to create a case class to represent Donut objects")
case class Donut(name: String, price: Double)

2. How to create a Sequence of type Donut

Using the Donut case class from Step 1, the code below shows how to create a Sequence of type donuts.

println("\nStep 2: How to create a Sequence of type Donut")
val donuts: Seq[Donut] = Seq(Donut("Plain Donut", 1.5), Donut("Strawberry Donut", 2.0), Donut("Glazed Donut", 2.5))
println(s"Elements of donuts = $donuts")

You should see the following output when you run your Scala application in IntelliJ:

Step 2: How to create a Sequence of type Donut
Elements of donuts = List(Donut(Plain Donut,1.5), Donut(Strawberry Donut,2.0), Donut(Glazed Donut,2.5))

3. How to sort a sequence of case class objects using the sortBy function

The code below shows how to use the sortBy method to sort the Sequence of type donuts from Step 2. Note that we will sort each donut element by using its price property.

println("\nStep 3: How to sort a sequence of case class objects using the sortBy function")
println(s"Sort a sequence of case class objects of type Donut, sorted by price = ${donuts.sortBy(donut => donut.price)}")

You should see the following output when you run your Scala application in IntelliJ:

Step 3: How to sort a sequence of case class objects using the sortBy function
Sort a sequence of case class objects of type Donut, sorted by price = List(Donut(Plain Donut,1.5), Donut(Strawberry Donut,2.0), Donut(Glazed Donut,2.5))