如何在Go中尽可能均匀地随机分割地图？

Question

I have a quick question. I am fairly new to golang. Say I have a map like so:

map[int]string

How could I randomly split it into two maps or arrays and as close to even as possible? So for example, if there are 15 items, it would be split 7 - 8.

Answer 1

For example:

func split(m map[int]string) (odds map[int]string, evens map[int]string) {
    n := 1
    odds = make(map[int]string)
    evens = make(map[int]string)
    for key, value := range m {
        if n % 2 == 0 {
            evens[key] = value
        } else {
            odds[key] = value
        }
        n++
    }
    return odds, evens
}

It is actually an interesting example, because it shows a few aspects of Go that are not obvious for beginners:

• range m iterates in a random order, unlike in any other language as far as I know,
• the modulo operator % returns the remainder of the integer division,
• a function can return several values.