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.