Convert an array to a set in Kotlin

This article explores different ways to convert an array to a set using Kotlin. Assume that the array contains all distinct elements; otherwise, all duplicates would be silently discarded.

1. Using `toSet()` function

In Kotlin, the standard way to convert the specified array to a set is with the toSet() or toMutableSet() function.

fun <T> convertToSet(array: Array<T>): Set<T> {

return array.toSet()

}

fun main() {

val array = arrayOf("A", "B", "C", "D", "E")

val set = convertToSet(array)

println(set) // [A, B, C, D, E]

}

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2. Using `setOf()` function

Another plausible way is to pass the expanded array returned by the Spread operator to the setOf() or mutableSetOf function.

fun main() {

val array = arrayOf("A", "B", "C", "D", "E")

val set = setOf(*array)

println(set) // [A, B, C, D, E]

}

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3. Using for loop

Finally, you can write your own custom logic for this task. The idea is to create an empty set and push every element of the specified array to it using a for-loop.

fun <T> convertToSet(array: Array<T>): Set<T> {

val set: MutableSet<T> = HashSet()

for (i in array) {

set.add(i)

}

return set

}

fun main() {

val array = arrayOf("A", "B", "C", "D", "E")

val set = convertToSet(array)

println(set) // [A, B, C, D, E]

}

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That’s all about converting an array to a set in Kotlin.

Convert an array to a set in Kotlin

1. Using toSet() function

2. Using setOf() function

3. Using for loop

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1. Using `toSet()` function

2. Using `setOf()` function