Steps

1. How to initialize a Sequence of Tuple3 elements

In the previous Unzip Tutorial, we showed how to use the zip and unzip methods to merge and unmerge Tuple2 elements from and to collections.

In the example below, we will create a Sequence of Tuple3 elements to represent donut name, its price and a taste level.

println("Step 1: How to initialize a Sequence of Tuple3 elements")
val donuts: Seq[(String, Double, String)] = Seq(("Plain Donut",1.5,"Tasty"), ("Glazed Donut",2.0,"Very Tasty"), ("Strawberry Donut",2.5,"Very Tasty"))
println(s"Donuts tuple3 elements = $donuts")

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

Step 1: How to initialize a Sequence of Tuple3 elements
Donuts tuple3 elements = List((Plain Donut,1.5,Tasty), (Glazed Donut,2.0,Very Tasty), (Strawberry Donut,2.5,Very Tasty))

2. How to call unzip3 function to unzip Tuple3 elements 

Similar to the unzip method, Scala provides a convenient unzip3 method to unzip Tuple3 elements from a collection into three separate collections.

As shown in the example below, by calling unzip3 on the donuts Immutable Sequence from Step 1, we get back a Tuple3 type where each element is a collection for each of the Tuple3 elements. In other words, we have a Sequence for donut names, prices and taste level.

println("\nStep 2: How to call unzip3 function to unzip Tuple3 elements")
val unzipped: (Seq[String], Seq[Double], Seq[String]) = donuts.unzip3
println(s"Unzipped donut names = ${unzipped._1}")
println(s"Unzipped donut prices = ${unzipped._2}")
println(s"Unzipped donut taste = ${unzipped._3}")

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

Step 2: How to call unzip3 function to unzip Tuple3 elements
Unzipped donut names = List(Plain Donut, Glazed Donut, Strawberry Donut)
Unzipped donut prices = List(1.5, 2.0, 2.5)
Unzipped donut taste = List(Tasty, Very Tasty, Very Tasty)