How to Initialize a Set in Kotlin - Step by Step Examples

How to Initialize a Set in Kotlin ?

Answer

To initialize a set in Kotlin, you can use the setOf function or the mutableSetOf function for immutable and mutable sets, respectively.

✐ Examples

1 Initialize an Immutable Set Using setOf

In this example,

We use the setOf function, which is a standard library function in Kotlin that creates a read-only (immutable) set.
We declare a variable named set1 and assign it the result of calling the setOf function with several string arguments, such as "apple", "banana", and "cherry".
The setOf function creates an immutable set containing the specified elements.
We then print the set1 to the standard output to verify its contents. Immutable sets do not allow modification, so we will not attempt to add or remove elements from it.

Kotlin Program

fun main() {
    val set1 = setOf("apple", "banana", "cherry")
    println("Contents of set1: $set1")
}

Output

Contents of set1: [apple, banana, cherry]

2 Initialize a Mutable Set Using mutableSetOf

In this example,

We use the mutableSetOf function, which is a standard library function in Kotlin that creates a mutable set.
We declare a variable named set2 and assign it the result of calling the mutableSetOf function with several string arguments, such as "apple", "banana", and "cherry".
The mutableSetOf function creates a mutable set containing the specified elements.
We add an element to set2 using the add method, passing "date" as the argument.
We then remove an element from set2 using the remove method, passing "banana" as the argument.
Finally, we print the set2 to the standard output to verify its contents, demonstrating that the set can be modified.

Kotlin Program

fun main() {
    val set2 = mutableSetOf("apple", "banana", "cherry")
    set2.add("date")
    set2.remove("banana")
    println("Contents of set2: $set2")
}

Output

Contents of set2: [apple, cherry, date]

Summary

In this tutorial, we learned How to Initialize a Set in Kotlin language with well detailed examples.

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