Steps

1. How to initialize a Sequence of donuts

The code below shows how to initialize a Sequence of Donut elements of type String.

println("Step 1: How to initialize a Sequence of donuts")
val donuts: Seq[String] = Seq("Plain Donut", "Strawberry Donut", "Glazed Donut")
println(s"Elements of donuts = $donuts")

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

Step 1: How to initialize a Sequence of donuts
Elements of donuts = List(Plain Donut, Strawberry Donut, Glazed Donut)

2. How to find a particular element in the sequence using the find function

The code below shows how to use the find method to find a particular element in the sequence - more precisely to find for a Plain Donut element in the donut sequence.

println("\nStep 2: How to find a particular element in the sequence using the find function")
val plainDonut: Option[String] = donuts.find(donutName => donutName == "Plain Donut")
println(s"Find Plain Donut = ${plainDonut.get}")

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

Step 2: How to find a particular element in the sequence using the find function
Find Plain Donut = Plain Donut

NOTE:

• The find method returns an Option type and as such it returned an Option of type String in the above example.

3. How to find element Vanilla Donut which does not exist in the sequence using the find function

The code below shows how to use the find method to find a Vanilla Donut element in the donut sequence. Note however that there is no Vanilla Donut element in the donut sequence which we created in Step 1.

println("\nStep 3: How to find element Vanilla Donut which does not exist in the sequence using the find function")
val vanillaDonut: String = donuts.find(_ == "Vanilla Donut").get
println(s"Find Vanilla Donuts = $vanillaDonut")

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

Step 3: How to find element Vanilla Donut which does not exist in the sequence using the find function
Exception in thread "main" java.util.NoSuchElementException: None.get

NOTE:

• Since the find method returns an Option, you should be careful with simply calling .get otherwise you may get the java.util.NoSuchElementException: None.get exception

4. How to find element Vanilla Donut using the find function and getOrElse

The code below shows how to use the find method which returns an Option type and make use of the getOrElse method to avoid getting java.util.NoSuchElementException: None.get exception for the cases when the find method does not match any elements.

println("\nStep 4: How to find element Vanilla Donut using the find function and getOrElse")
val vanillaDonut2: String = donuts.find(_ == "Vanilla Donut").getOrElse("Vanilla Donut was not found!")
println(s"Find Vanilla Donuts = $vanillaDonut2")

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

Step 4: How to find element Vanilla Donut using the find function and getOrElse
Find Vanilla Donuts = Vanilla Donut was not found!