Kotlin List component1()
Syntax & Examples

Syntax of List.component1()

The syntax of List.component1() extension function is:

operator fun <T> List<T>.component1(): T

This component1() extension function of List returns 1st element from the list.


✐ Examples

1 Example

In this example,

  • We create a list named list containing integers from 1 to 5.
  • We use the component1 function to get the first element of list.
  • The first element is stored in firstElement.
  • We print the first element using println.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf(1, 2, 3, 4, 5)
    val firstElement = list.component1()
    println("The first element is: \$firstElement")
}

Output

The first element is: 1

2 Example

In this example,

  • We create a list named list containing characters 'a', 'b', 'c', 'd'.
  • We use the component1 function to get the first element of list.
  • The first element is stored in firstElement.
  • We print the first element using println.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf('a', 'b', 'c', 'd')
    val firstElement = list.component1()
    println("The first element is: \$firstElement")
}

Output

The first element is: a

3 Example

In this example,

  • We create a list named list containing strings "apple", "banana", "cherry".
  • We use the component1 function to get the first element of list.
  • The first element is stored in firstElement.
  • We print the first element using println.

Kotlin Program

fun main(args: Array<String>) {
    val list = listOf("apple", "banana", "cherry")
    val firstElement = list.component1()
    println("The first element is: \$firstElement")
}

Output

The first element is: apple

Summary

In this Kotlin tutorial, we learned about component1() extension function of List: the syntax and few working examples with output and detailed explanation for each example.