Sum of the elements of an array using multithreading and dividi et impera in Golang.

ArraySum.go

package main

import "fmt"

func dividiEtImpera( arr []int, low int, hi int, ch chan int){
    
    if hi - low == 1{
//        fmt.Println("low: ", low, " hi:", hi, " Caso hi-low==1, ritorno:",arr[hi-1], "+", arr[low]
        ch <- arr[hi-1] + arr[low]
    } else if hi-low == 0{
//        fmt.Println("low: ", low, " hi:", hi," Caso hi-low==0, ritorno:",arr[low])
        ch <- arr[low]
    }else{   

    half := int( (low+hi)/2 )
//    fmt.Println("low: ", low, " hi:", hi, " half: ",half)
    
    ch1, ch2 := make(chan int), make(chan int)


    go dividiEtImpera(arr, low, half, ch1)
    go dividiEtImpera(arr, half+1, hi, ch2)

    firstHalf, secondHalf := <- ch1, <- ch2
//    fmt.Println("firsthalf: ", firstHalf, " secondhalf:", secondHalf)
    ch <- (firstHalf+secondHalf)
    }
}

func main(){
    var arr = []int{1, 2, 3, 4, 5, 6}
    ch := make(chan int, 1)
    dividiEtImpera(arr, 0, len(arr)-1, ch)    
    fmt.Println("The sum of:",arr,"is:", <- ch)
    
}