How can I initialize a nested map inside a struct in Go?

Question

If I have a nested map variable like this inside a struct:

type someStruct struct {
    nestedMap map[int]map[string]string
}

var ss = someStruct {
    nestedMap: make(map[int]map[string]string),
}

This does not work and does a runtime error.

How do I initialize it?

Answer 1

You have to make the child maps as well.

func (s *someStruct) Set(i int, k, v string) {
    child, ok := s.nestedMap[i]
    if !ok {
        child = map[string]string{}
        s.nestedMap[i] = child
    }
    child[k] = v
}

playground

Answer 2

Initilize nested map like this:

temp := make(map[string]string,1)
temp ["name"]="Kube"
ss.nestedMap [2] = temp
fmt.Println(ss)