Why does this program panic?var m map[string]float64 m["pi"] = 3.1416panic: assignment to entry in nil mapAnswerYou have to initialize the…
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");
}
}