How to check if a List is Empty in Kotlin?

Kotlin – Check if List is Empty

To check if a List is empty in Kotlin, call isEmpty() function on this List object.

The Kotlin List.isEmpty() function checks if the list is empty or not, and returns a boolean value.

Syntax of List.isEmpty()

The syntax of List.isEmpty() function is

list.isEmpty()

Return Value

List.isEmpty() function returns true if the collection is empty (contains no elements), false otherwise.

Example 1: Check if List is Empty

In this example, we will take an empty list, and check if it is empty or not programmatically.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf<String>()
    if (list1.isEmpty()) {
        print("List is empty.")
    } else {
        print("List is not empty.")
    }
}

Output

List is empty.

Example 2: isEmpty() with Non-empty List

In this example, we will take a list with some elements, and check if the list is empty using isEmpty() function.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf("ab", "bc", "cd", "de")
    if (list1.isEmpty()) {
        print("List is empty.")
    } else {
        print("List is not empty.")
    }
}

Output

List is not empty.

Conclusion

In this Kotlin Tutorial, we learned how to check if a list is empty or not, using Kotlin List.isEmpty() function.