How to count the Number of Occurrences of Specific Element in the List in Kotlin - Step by Step Examples

How to count the Number of Occurrences of Specific Element in the List in Kotlin ?

Answer

To count the number of occurrences of a specific element in a list in Kotlin, you can use the count method along with a lambda expression to specify the element to count.


✐ Examples

1 Count Occurrences of Element in List

In this example,

  1. We create a list named numbers containing integer elements.
  2. We use the count method with a lambda expression that checks for the desired element.
  3. The lambda expression returns true when the element matches, and the count method tallies the occurrences.
  4. Finally, we print the count to standard output.

Kotlin Program

fun main() {
    val numbers = listOf(1, 2, 3, 4, 1, 2, 1)
    val count = numbers.count { it == 1 }
    println("Count of 1 is: $count")
}

Output

Count of 1 is: 3

2 Count Occurrences of String in List

In this example,

  1. We create a list named words containing string elements.
  2. We use the count method with a lambda expression to check for the desired string.
  3. The lambda expression returns true when the string matches, and the count method tallies the occurrences.
  4. Finally, we print the count to standard output.

Kotlin Program

fun main() {
    val words = listOf("apple", "banana", "apple", "cherry")
    val count = words.count { it == "apple" }
    println("Count of 'apple' is: $count")
}

Output

Count of 'apple' is: 2

Summary

In this tutorial, we learned How to count the Number of Occurrences of Specific Element in the List in Kotlin language with well detailed examples.


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