scala set contains all

Scala is a programming language that runs on the Java Virtual Machine (JVM). In Scala, you can use the Set data structure to store a collection of unique elements. The Set data structure in Scala is immutable by default, meaning that once it is created, you cannot modify its contents. However, you can perform various operations on a Set, such as adding elements, removing elements, checking if an element is present, and performing set operations like union, intersection, and difference.

To create a Set in Scala, you can use the Set companion object's apply method or simply use the curly braces {}. Here's an example of creating a Set:

val mySet = Set(1, 2, 3, 4, 5)

In this example, mySet is a Set that contains the elements 1, 2, 3, 4, and 5. Since Sets in Scala are immutable, you cannot add or remove elements from mySet. If you want to add or remove elements, you can create a new Set based on the existing one.

To check if an element is present in a Set, you can use the contains method. Here's an example:

val mySet = Set(1, 2, 3, 4, 5)

if (mySet.contains(3)) {
  println("3 is present in the set")
} else {
  println("3 is not present in the set")

This code will output "3 is present in the set" because the element 3 is indeed present in mySet.

Scala Sets also support set operations like union, intersection, and difference. Here are some examples:

val set1 = Set(1, 2, 3)
val set2 = Set(3, 4, 5)

val unionSet = set1.union(set2) // Union of set1 and set2
val intersectionSet = set1.intersect(set2) // Intersection of set1 and set2
val differenceSet = set1.diff(set2) // Difference between set1 and set2

println(unionSet) // Output: Set(1, 2, 3, 4, 5)
println(intersectionSet) // Output: Set(3)
println(differenceSet) // Output: Set(1, 2)

In this code, unionSet will contain all the elements from set1 and set2, intersectionSet will contain only the elements that are present in both set1 and set2, and differenceSet will contain the elements present in set1 but not in set2.

That's a brief overview of Sets in Scala and some of the operations you can perform on them. Let me know if you have any further questions.