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Mastering Kotlin Essentials

Set Operations

Explore how to work with sets in Kotlin collections. Understand methods for removing duplicates by converting lists to sets, checking set size and emptiness, verifying element membership, and iterating over sets using loops. This lesson equips you with essential skills for handling set operations effectively in Kotlin programming.

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Removing duplicates

The most efficient way to remove duplicates from a list is by transforming it into a set.

Kotlin 1.5
fun main() {
    val names = listOf("Jake", "John", "Jake", "James", "Jan")
    println(names) // [Jake, John, Jake, James, Jan]
    val unique = names.toSet()
    println(unique) // [Jake, John, James, Jan]
}

Checking set size

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