How to get the Index of Specified Element in a List in Kotlin - Step by Step Examples

How to get the Index of Specified Element in a List in Kotlin ?

Answer

To find the index of a specified element in a list in Kotlin, you can use the indexOf method of the List class.


✐ Examples

1 Find Index of Element in List

In this example,

  1. We create a list named myList with some elements.
  2. We use the indexOf method of the list object myList to find the index of a specific element.
  3. The indexOf method returns the index of the first occurrence of the element in the list, or -1 if the element is not found.
  4. Finally, we print the index to standard output.

Kotlin Program

fun main() {
    val myList = listOf(10, 20, 30, 40, 50)
    val index = myList.indexOf(40)
    println("Index of element is: $index")
}

Output

Index of element is: 3

2 Find Index of String in List

In this example,

  1. We create a list named myList with some string elements.
  2. We use the indexOf method of the list object myList to find the index of a specific string.
  3. The indexOf method returns the index of the first occurrence of the string in the list, or -1 if the string is not found.
  4. Finally, we print the index to standard output.

Kotlin Program

fun main() {
    val myList = listOf("apple", "banana", "cherry", "date", "elderberry")
    val index = myList.indexOf("cherry")
    println("Index of element is: $index")
}

Output

Index of element is: 2

Summary

In this tutorial, we learned How to get the Index of Specified Element in a List in Kotlin language with well detailed examples.


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