In Go, before using a map, it must be initialized, otherwise an attempt to write to it will cause a panic (runtime panic). To handle the situation when the map is not yet initialized (i.e., is nil), you can:

Check if the map is initialized before use:

var m map[string]int
if m == nil {
    m = make(map[string]int)
}
 m["key"] = 42

Or initialize the map immediately at declaration:

m := make(map[string]int)
 m["key"] = 42

Always ensure that the map is not nil before writing to it.

Eelmine Edasi