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.