Steps

1. How to initialize a Map with 3 elements using Tuples of key and value

The code below shows how to initialize a Map with 3 elements using Tuples of key and value.

println("Step 1: How to initialize a Map with 3 elements")
val map1: Map[String, String] = Map(("PD","Plain Donut"),("SD","Strawberry Donut"),("CD","Chocolate Donut"))
println(s"Elements of map1 = $map1")

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

Step 1: How to initialize a Map with 3 elements
Elements of map1 = Map(PD -> Plain Donut, SD -> Strawberry Donut, CD -> Chocolate Donut)

2. How to initialize Map using key -> value notation

The code below shows how to initialize Map using key -> value notation.

println("\nStep 2: How to initialize Map using key -> value notation")
val map2: Map[String, String] = Map("VD"-> "Vanilla Donut", "GD" -> "Glazed Donut")
println(s"Elements of map1 = $map2")

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

Step 2: How to initialize Map using key -> value notation
Elements of map1 = Map(VD -> Vanilla Donut, GD -> Glazed Donut)

3. How to access elements by specific key

The code below shows how to access elements by specific key

println("\nStep 3: How to access elements by specific key")
println(s"Element by key VD = ${map2("VD")}")
println(s"Element by key GD = ${map2("GD")}")

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

Step 3: How to access elements by specific key
Element by key VD = Vanilla Donut
Element by key GD = Glazed Donut

4. How to add elements to Map using +

The code below shows how to add elements using +

println("\nStep 4: How to add elements using +")
val map3: Map[String, String] = map1 + ("KD" -> "Krispy Kreme Donut")
println(s"Element in map3 = $map3")

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

Step 4: How to add elements using +
Element in map3 = Map(PD -> Plain Donut, SD -> Strawberry Donut, CD -> Chocolate Donut, KD -> Krispy Kreme Donut)

5. How to add two Maps together using ++

The code below shows how to add two Maps together using ++

println("\nStep 5: How to add two Maps together using ++")
val map4: Map[String, String] = map1 ++ map2
println(s"Elements in map4 = $map4")

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

Step 5: How to add two Maps together using ++
Elements in map4 = Map(PD -> Plain Donut, GD -> Glazed Donut, SD -> Strawberry Donut, VD -> Vanilla Donut, CD -> Chocolate Donut)

6. How to remove key and its value from map using -

The code below shows how to remove key and its value from map using -

println("\nStep 6: How to remove key and its value from map using -")
val map5: Map[String, String] = map4 - ("CD")
println(s"Map without the key CD and its value = $map5")

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

Step 6: How to remove key and its value from map using -
Map without the key CD and its value = Map(PD -> Plain Donut, GD -> Glazed Donut, SD -> Strawberry Donut, VD -> Vanilla Donut)

7. How to initialize an empty Map

The code below shows how to how to initialize an empty Map

println("\nStep 7: How to initialize an empty Map")
val emptyMap: Map[String,String] = Map.empty[String,String]
println(s"Empty Map = $emptyMap")

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

Step 7: How to initialize an empty Map
Empty Map = Map()