Steps

1. How to initialize a Set with 3 elements

The code below shows how to initialize a Set with 3 elements.

println("Step 1: How to initialize a Set with 3 elements")
val set1: Set[String] = Set("Plain Donut","Strawberry Donut","Chocolate Donut")
println(s"Elements of set1 = $set1")

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

Step 1: How to initialize a Set with 3 elements
Elements of set1 = Set(Plain Donut, Strawberry Donut, Chocolate Donut)

2. How to check specific elements exists in Set

The code below shows how to check specific elements exists in Set.

println("\nStep 2: How to check specific elements exists in Set")
println(s"Element Plain Donut = ${set1("Plain Donut")}")
println(s"Element Strawberry Donut = ${set1("Strawberry Donut")}")
println(s"Element Chocolate Donut = ${set1("Chocolate Donut")}")

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

Step 2: How to check specific elements exists in Set
Element Plain Donut = true
Element Strawberry Donut = true
Element Chocolate Donut = true

3. How to add elements in Set using +

The code below shows how to add elements in Set using +.

println("\nStep 3: How to add elements in Set using +")
val set2: Set[String] = set1 + "Vanilla Donut" + "Vanilla Donut"
println(s"Adding elements to Set using + = $set2")

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

Step 3: How to add elements in Set using +
Adding elements to Set using + = Set(Plain Donut, Strawberry Donut, Chocolate Donut, Vanilla Donut)

NOTE:

• We only have one Vanilla Donut element as Set only allows distinct values.

4. How to add two Sets together using ++

The code below shows how to add two Sets together using ++.

println("\nStep 4: How to add two Sets together using ++")
val set3: Set[String] = set1 ++ Set[String]("Vanilla Donut", "Glazed Donut")
println(s"Add two Sets together using ++ = $set3")

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

Step 4: How to add two Sets together using ++
Add two Sets together using ++ = Set(Vanilla Donut, Plain Donut, Chocolate Donut, Strawberry Donut, Glazed Donut)

5. How to remove element from Set using -

The code below shows how to remove element from Set using -.

println("\nStep 5: How to remove element from Set using -")
val set4: Set[String] = set1 - "Plain Donut"
println(s"Set without Plain Donut element = $set4")

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

Step 5: How to remove element from Set using -
Set without Plain Donut element = Set(Strawberry Donut, Chocolate Donut)

6. How to find the intersection between two Sets using &

The code below shows how to find the intersection between two Sets using &.

println("\nStep 6: How to find the intersection between two Sets using &")
val set5: Set[String] = Set("Vanilla Donut", "Glazed Donut", "Plain Donut")
println(s"Intersection of set1 and set5 = ${set1 & set5}")

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

Step 6: How to find the intersection between two Sets using &
Intersection of set1 and set5 = Set(Plain Donut)

7. How to find the difference between two Sets using &~

The code below shows how to find the difference between two Sets using &~

println("\nStep 7: How to find the difference between two Sets using &~")
println(s"Difference between set1 and set5 = ${set1 &~ set5}")

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

Step 7: How to find the difference between two Sets using &~
Difference between set1 and set5 = Set(Strawberry Donut, Chocolate Donut)

8. How to initialize an empty Set

The code below shows how to initialize an empty Set.

println("\nStep 8: How to initialize an empty Set")
val emptySet: Set[String] = Set.empty[String]
println(s"Empty Set = $emptySet")

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

Step 8: How to initialize an empty Set
Empty Set = Set()