What does nil mean in golang?

Question

There are many cases using nil in golang. For example:

func (u *URL) Parse(ref string) (*URL, error) {
    refurl, err := Parse(ref)
    if          


        

Answer 1

• For the data types like slice and pointers which "refer" to other types, "nil" indicates that the variable does not refer to an instance (equivalent of null pointer in other languages)
• It is thee zero value of the variables of type functions, maps, interfaces, channels and structures