How to check if a Set is Empty in Kotlin

◀ Previous Next ▶

How to check if a Set is Empty in Kotlin ?

Answer

To check if a Set is empty in Kotlin, you can utilize the isEmpty() method provided by the Set interface.

✐ Examples

1 Check if Set is Empty

In this example,

We declare a Set named set with some elements, or an empty Set if there are no elements.
We use the isEmpty() method on the Set set to determine if it contains any elements.
If the Set is empty, the isEmpty() method returns true; otherwise, it returns false.
We print the result to the standard output to indicate whether the Set is empty or not.

Kotlin Program

fun main() {
    val set = setOf("a", "b", "c") // Or val set = emptySet<String>() for an empty Set
    val isEmpty = set.isEmpty()
    if (isEmpty) {
        println("The Set is empty")
    } else {
        println("The Set is not empty")
    }
}

Output

The Set is not empty

2 Check if Empty Set is Empty

In this example,

We declare an empty Set named emptySet.
We use the isEmpty() method on the Set emptySet to determine if it contains any elements.
Since the Set is empty, the isEmpty() method returns true.
We print the result to the standard output to indicate that the Set is indeed empty.

Kotlin Program

fun main() {
    val emptySet = emptySet<String>()
    val isEmpty = emptySet.isEmpty()
    if (isEmpty) {
        println("The Set is empty")
    } else {
        println("The Set is not empty")
    }
}

Output

The Set is empty

Summary

In this tutorial, we learned How to check if a Set is Empty in Kotlin language with well detailed examples.

◀ Previous Next ▶

Kotlin Tutorials

Kotlin How-Tos

How to check if a Set is Empty in Kotlin

How to check if a Set is Empty in Kotlin ?

Answer

✐ Examples

1 Check if Set is Empty

Kotlin Program

Output

2 Check if Empty Set is Empty

Kotlin Program

Output

Summary

More Kotlin Sets Tutorials