Steps

1. How to initialize a Sequence of donuts

The code below shows how to create a Sequence of type String to represent a donut collection.

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 initialize a Sequence of donut prices

Similar to Step 1, we will initialize another Sequence but of type Double to represent donut prices.

println("\nStep 2: How to initialize a Sequence of donut prices")
val donutPrices: Seq[Double] = Seq(1.5, 2.0, 2.5)
println(s"Elements of donut prices = $donutPrices")

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

Step 2: How to initialize a Sequence of donut prices
Elements of donut prices = List(1.5, 2.0, 2.5)

3. How to use zip method to zip two collections

Using the zip method, you can easily merge two collections into a single one which will consist of pairs or elements as Tuples. As such, let's zip the donuts and donutPrices collections into a single collection using the zip method.

println("\nStep 3: How to use zip method to zip two collections")
val zippedDonutsAndPrices: Seq[(String, Double)] = donuts zip donutPrices
println(s"Zipped donuts and prices = $zippedDonutsAndPrices")

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

Step 3: How to use zip method to zip two collections
Zipped donuts and prices = List((Plain Donut,1.5), (Strawberry Donut,2.0), (Glazed Donut,2.5))

NOTE:

• The elements of the resulting zipped collections are tuples with donut names along with their corresponding prices.

4. How to use unzip method to un-merge a zipped collections

In the Learn How To Use Unzip Function With Examples tutorial, we showed how to use the unzip method. The example below is a review on using unzip method to un-merge the donut names and prices collections.

println("\nStep 4: How to use unzip method to un-merge a zipped collections")
val unzipped: (Seq[String], Seq[Double]) = zippedDonutsAndPrices.unzip
println(s"Donut names unzipped = ${unzipped._1}")
println(s"Donut prices unzipped = ${unzipped._2}")

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

Step 4: How to use unzip method to un-merge a zipped collections
Donut names unzipped = List(Plain Donut, Strawberry Donut, Glazed Donut)
Donut prices unzipped = List(1.5, 2.0, 2.5)