How to create an Empty Set in Kotlin - Step by Step Examples

How to create an Empty Set in Kotlin ?

To create an empty set in Kotlin, you can use the emptySet function or the setOf function with no arguments.

In this example,

We use the emptySet function which is a standard library function in Kotlin that returns an empty read-only set.
We declare a variable named set1 and assign it the result of the emptySet function.
The emptySet function is generic and infers the type of the set based on the context. If no context is provided, it will create a set of type Nothing.
We then print the set1 to standard output to verify its contents.

fun main(args: Array<String>) {
    val set1 = emptySet<String>()
    println("Contents of set1: $set1")
}

Contents of set1: []

In this example,

We use the setOf function which is a standard library function in Kotlin that can be used to create a read-only set.
We declare a variable named set2 and assign it the result of the setOf function with no arguments.
The setOf function is also generic and infers the type of the set based on the context. Here, we explicitly specify the type String to ensure the set is of type Set.
We then print the set2 to standard output to verify its contents.

fun main(args: Array<String>) {
    val set2 = setOf<String>()
    println("Contents of set2: $set2")
}

Contents of set2: []

In this tutorial, we learned How to create an Empty Set in Kotlin language with well detailed examples.