카타 8급 Beginner - Reduce but Grow

1 Kotlin

package reducebutgrow
fun grow(arr: IntArray): Int {
    var res = 1
    arr.forEach { res *= it }
    return res
}

package reducebutgrow
fun grow(arr: IntArray): Int = arr.reduce { a, b -> a * b }

package reducebutgrow
fun grow(arr: IntArray) = arr.reduce(Int::times)

package reducebutgrow
fun grow(arr: IntArray): Int {
  return arr.reduce{acc,i -> acc*i}
}

package reducebutgrow
fun grow(arr: IntArray): Int {
    return arr.reduce(Int::times)
}