delete map[key] in go?

Question

I have a map:

var sessions =  map[string] chan int{}

How do I delete sessions[key]? I tried:

sessions[key] = nil,         


        

Answer 1

Strangely enough,

package main

func main () {
    var sessions = map[string] chan int{};
    delete(sessions, "moo");
}

seems to work. This seems a poor use of resources though!

Another way is to check for existence and use the value itself:

package main

func main () {
    var sessions = map[string] chan int{};
    sessions["moo"] = make (chan int);
    _, ok := sessions["moo"];
    if ok {
        delete(sessions, "moo");
    }
}