在数组golang中连接整数-GoLang

Question

I have an array with 3 positions, imagine it has the number 5 in all of them.

[5 5 5]

how can I pass it to a var in a way that it stays 555? just like this.

n:= 555 

Answer 1

The same way you would in any other language:

s := []int{1, 2, 3}
n := 0
for _, sn := range s {
    n *= 10
    n += sn
}

Playground: http://play.golang.org/p/SSemwbJuTz.

Edit: if you're planning to work with more that just single-digit numbers, the loop is a bit trickier:

for _, sn := range s {
    shift := 10
    for shift < sn {
        shift *= 10
    }
    n *= shift
    n += sn
}

This works with inputs like []int{1, 23, 456}: http://play.golang.org/p/h1xsu9vtmP.

Look out for the integer overflow though.