How to find the average of elements in an ArrayList in Kotlin

How to find the average of elements in an ArrayList in Kotlin.

Here's a step-by-step tutorial on how to find the average of elements in an ArrayList in Kotlin:

1. First, create an ArrayList and add elements to it:

val numbers = arrayListOf(10, 20, 30, 40, 50)

2. Next, calculate the sum of all the elements in the ArrayList using the sum() function:

val sum = numbers.sum()

3. Get the size of the ArrayList using the size property:

val size = numbers.size

4. Calculate the average by dividing the sum by the size:

val average = sum.toDouble() / size

5. Finally, print the average:

println("The average is: $average")

Here's the complete code:

fun main() {
    val numbers = arrayListOf(10, 20, 30, 40, 50)
    val sum = numbers.sum()
    val size = numbers.size
    val average = sum.toDouble() / size
    println("The average is: $average")
}

Output:

The average is: 30.0

Alternatively, you can also use the average() function provided by Kotlin's standard library to directly calculate the average of the elements in the ArrayList:

fun main() {
    val numbers = arrayListOf(10, 20, 30, 40, 50)
    val average = numbers.average()
    println("The average is: $average")
}

Output:

The average is: 30.0

That's it! You now know how to find the average of elements in an ArrayList in Kotlin.