Kotlin Array - average() Function

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The Kotlin array average() function is used to calculates the average of all the elements of an array. This function works on integers as well as other types and returns a double value.

Following are the types −

• Byte
• Short
• Int
• Long
• Float
• Double

Syntax

Following is the syntax of Kotlin array average() function −

fun IntArray.average(): Double

Parameters

This function does not accepts any parameters

Return value

This function returns an average value of types double.

Example 1

Following is the basic example, we use the average() function to calculates the average of an integer array −

fun main(args: Array<String>) {
   var array = Array(10) { i -> i}

   var result=array.average()
   print("The average of ( ")
   for(i in array)
      print("$i ")
   print(") is $result")
}

Output

Following is the output −

The average of ( 0 1 2 3 4 5 6 7 8 9 ) is 4.5

Example 2

Now, let's see another example. Here, we use the average() function to calculates the average of a float array −

fun main() {
   val array = arrayOf(5.5f, 6.5f, 7.5f, 8.5f)

   val result = array.average()
   println("The average of (${array.joinToString(", ")}) is $result")
}

Output

Following is the output −

The average of (5.5, 6.5, 7.5, 8.5) is 7.0

Example 3

The example below calculates the average of the short array using the average() function −

fun main() {
   val numbers: Array<Short> = arrayOf(1, 2, 3, 4, 5)
   val average = numbers.average()
   println("The average is $average")
}

Output

Following is the output −

The average is 3.0