Kotlin List isNotEmpty()
Syntax & Examples

Syntax of List.isNotEmpty()

The syntax of List.isNotEmpty() extension function is:

fun <T> Collection<T>.isNotEmpty(): Boolean

This isNotEmpty() extension function of List returns true if the collection is not empty.


✐ Examples

1 Example

In this example,

  • We create a list of strings named list1 containing elements "apple", "banana", "cherry".
  • We check if list1 is not empty using the isNotEmpty() function.
  • Since list1 is not empty, the result is true.
  • Finally, we print the result to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list1 = listOf("apple", "banana", "cherry")
    val result = list1.isNotEmpty()
    println(result)
}

Output

true

2 Example

In this example,

  • We create a list of integers named list2 containing elements 10, 20, 30.
  • We check if list2 is not empty using the isNotEmpty() function.
  • Since list2 is not empty, the result is true.
  • Finally, we print the result to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list2 = listOf(10, 20, 30)
    val result = list2.isNotEmpty()
    println(result)
}

Output

true

3 Example

In this example,

  • We create a list of strings named list3 containing elements "red", "blue", "green".
  • We check if list3 is not empty using the isNotEmpty() function.
  • Since list3 is not empty, the result is true.
  • Finally, we print the result to standard output using println statement.

Kotlin Program

fun main(args: Array<String>) {
    val list3 = listOf("red", "blue", "green")
    val result = list3.isNotEmpty()
    println(result)
}

Output

true

Summary

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