How to count the Number of Occurrences of Specified Element in the Array in Kotlin - Step by Step Examples

How to count the Number of Occurrences of Specified Element in the Array in Kotlin ?

Answer

To count the number of occurrences of a specified element in an array in Kotlin, you can use the count method of the Array class.


✐ Examples

1 Count Occurrences of Element in Array of Integers

In this example,

  1. We create an array named arr with integer values.
  2. We use the count method of the array object arr with a lambda expression to count the occurrences of a specific integer.
  3. The lambda expression checks if each element in the array is equal to the specified integer.
  4. The count method returns the number of elements that match the condition.
  5. Finally, we print the count to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val arr = arrayOf(1, 2, 3, 2, 4, 2, 5)
    val count = arr.count { it == 2 }
    println("Number of occurrences of element 2: $count")
}

Output

Number of occurrences of element 2: 3

2 Count Occurrences of Element in Array of Strings

In this example,

  1. We create an array named arr with string values.
  2. We use the count method of the array object arr with a lambda expression to count the occurrences of a specific string.
  3. The lambda expression checks if each element in the array is equal to the specified string.
  4. The count method returns the number of elements that match the condition.
  5. Finally, we print the count to standard output.

Kotlin Program

fun main(args: Array<String>) {
    val arr = arrayOf("apple", "banana", "cherry", "apple", "date", "apple")
    val count = arr.count { it == "apple" }
    println("Number of occurrences of element 'apple': $count")
}

Output

Number of occurrences of element 'apple': 3

Summary

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


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