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How to find the union of two HashSets in Kotlin

How to find the union of two HashSets in Kotlin.

Here is a step-by-step tutorial on how to find the union of two HashSets in Kotlin:

Step 1: Create two HashSets​

First, you need to create two HashSets that you want to find the union of. You can create a HashSet using the HashSet() constructor or the hashSetOf() function. For example:

val set1 = HashSet<Int>()
val set2 = hashSetOf(4, 5, 6)

In this example, set1 is an empty HashSet, and set2 is a HashSet with elements 4, 5, and 6.

Step 2: Add elements to the HashSets​

Next, you need to add elements to the HashSets. You can use the add() function to add elements to a HashSet. For example:

set1.add(1)
set1.add(2)
set1.add(3)

In this example, we add elements 1, 2, and 3 to set1.

Step 3: Find the union of the HashSets​

To find the union of two HashSets, you can use the union() function. This function returns a new HashSet that contains all the elements from both HashSets without any duplicates. For example:

val unionSet = set1.union(set2)

In this example, unionSet will contain the elements {1, 2, 3, 4, 5, 6}.

Step 4: Iterate over the unionSet​

If you want to perform any operations on the elements of the unionSet, you can iterate over it using a loop. For example:

for (element in unionSet) {
    // perform operations on each element
    println(element)
}

In this example, we print each element of the unionSet.

Step 5: Convert the unionSet to a list or array (optional)​

If you want to convert the unionSet to a list or array for further processing, you can use the toList() or toTypedArray() functions. For example:

val list = unionSet.toList()
val array = unionSet.toTypedArray()

In this example, list will contain the elements [1, 2, 3, 4, 5, 6], and array will contain the elements [1, 2, 3, 4, 5, 6].

That's it! You have successfully found the union of two HashSets in Kotlin.