Kotlin List toLongArray()
Syntax & Examples

Syntax of List.toLongArray()

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

fun Collection<Long>.toLongArray(): LongArray

This toLongArray() extension function of List returns an array of Long containing all of the elements of this collection.


✐ Examples

1 Example

In this example,

  • We create a list named longList containing long values 100L, 200L, 300L.
  • We use the toLongArray() function on longList to convert it to a LongArray.
  • We then print the longArray to standard output using contentToString().

Kotlin Program

fun main(args: Array<String>) {
    val longList = listOf(100L, 200L, 300L)
    val longArray = longList.toLongArray()
    println(longArray.contentToString())
}

Output

[100, 200, 300]

2 Example

In this example,

  • We create a list named longList containing long values 1000L, 2000L, 3000L.
  • We use the toLongArray() function on longList to convert it to a LongArray.
  • We then print the longArray to standard output using contentToString().

Kotlin Program

fun main(args: Array<String>) {
    val longList = listOf(1000L, 2000L, 3000L)
    val longArray = longList.toLongArray()
    println(longArray.contentToString())
}

Output

[1000, 2000, 3000]

3 Example

In this example,

  • We create a list named longList containing long values 5000L, 6000L, 7000L.
  • We use the toLongArray() function on longList to convert it to a LongArray.
  • We then print the longArray to standard output using contentToString().

Kotlin Program

fun main(args: Array<String>) {
    val longList = listOf(5000L, 6000L, 7000L)
    val longArray = longList.toLongArray()
    println(longArray.contentToString())
}

Output

[5000, 6000, 7000]

Summary

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