Kotlin List isEmpty()
Syntax & Examples

Syntax of List.isEmpty()

The syntax of List.isEmpty() function is:

abstract fun isEmpty(): Boolean

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

✐ Examples

1 Example

In this example,

We create a list named list1 containing the elements 'a', 'b', 'c'.
We check if list1 is empty using the List isEmpty() function, which returns true if the list has no elements.
Since list1 has elements, isEmpty() returns false.
Finally, we print the value of emptyCheck to standard output using the println function.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf("a", "b", "c")
    val emptyCheck = list1.isEmpty()
    println(emptyCheck)
}

Output

false

2 Example

In this example,

We create an empty list named list2.
We check if list2 is empty using the List isEmpty() function, which returns true if the list has no elements.
Since list2 has no elements, isEmpty() returns true.
Finally, we print the value of emptyCheck2 to standard output using the println function.

Kotlin Program

fun main(args: Array<String>) {
    val list2 = listOf<Int>()
    val emptyCheck2 = list2.isEmpty()
    println(emptyCheck2)
}

Output

true

Summary

In this Kotlin tutorial, we learned about isEmpty() function of List: the syntax and few working examples with output and detailed explanation for each example.