Convert an array to a set in Kotlin

Set has unique values, so to create an a Set from an Array we can use HashSet() function which returns a Set and take array list as parameter. In below example we will pass array with values: "a", "b", "c", "a" we should expect the output of set is: "a", "b", "c"

import java.util.*

fun main(args: Array<String>) {

    val array = arrayOf("a", "b", "c", "a")
    val set = HashSet(Arrays.asList(*array))

    println("Set: $set")

}

Output

Set: [a, b, c]

Set in Kotlin is case sensitive

In below example we will pass array with values: "a", "b", "c", "A" we should expect the output of set is: "a", "A", "b", "c"

import java.util.*

fun main(args: Array<String>) {

    val array = arrayOf("a", "b", "c", "A")
    val set = HashSet(Arrays.asList(*array))

    println("Set: $set")

}

Output

Set: [a, A, b, c]

Conclusion

In this page (written and validated by A. Gawali) you learned about Convert an array to a set in Kotlin . What's Next? If you are interested in completing Kotlin tutorial, we encourage you simply to start here: Kotlin Tutorial.

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