How can sum the elements in array in kotlin language?

package sum

fun sum(a: IntArray): Int {
  return 0
}

There's a built in function to sum an IntArray in Kotlin

val numbers: IntArray = intArrayOf(10, 20, 30, 40, 50)
val sum = numbers.sum()

Or to do it yourself...

fun sumArray(array: IntArray): Int{
    var sum = 0
    for(number in array){
        sum += number
    }
    return sum
}

You can use sum directly:

val sum = arrayOf(12, 33).sum()

You could do it as a stream

val sum = arrayOf(7, 9).fold(0) { acc, e -> acc + e }

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