Kotlin List.component4() Function

The Kotlin List.component4() function returns the fourth element in this list.

Syntax of List.component4()

The syntax of List.component4() function is

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list.component4()

Return Value

Kotlin List.component4() function returns fourth element from the list. If length of the list is less than 4, then the function throws java.lang.IndexOutOfBoundsException.

Example 1: Get Fourth Element in List

In this example, we will take a list of elements of string type, and get the fourth element from this list using List.component4() function.

Kotlin Program

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fun main(args: Array<String>) {
    val list1 = listOf("ab", "bc", "cd", "de", "ef", "fg", "gh")
    val fourth = list1.component4()
    print("Fourth element is : \"$fourth\"")
}

Output

Fourth element is : "de"

Example 2: List.component4() with List length < 4

If you call component4() function on list with length less than four, then the function throws java.lang.IndexOutOfBoundsException. Let us check with a Kotlin example program.

Kotlin Program

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fun main(args: Array<String>) {
    val list1 = listOf("ab", "bc", "cd")
    val fourth = list1.component4()
    print("Fourth element is : \"$fourth\"")
}

Output

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
	at java.base/java.util.Arrays$ArrayList.get(Arrays.java:4350)
	at HelloWorldKt.main(HelloWorld.kt:3)

Conclusion

In this Kotlin Tutorial, we learned how to get the fourth element of a list, using Kotlin List.component4() function.

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Kotlin List.component4() Function – Syntax & Examples