The Go Programming Language

12.8 Displaying the Methods of a Type

Our final example of reflection uses reflect.Type to print the type of an arbitrary value and enumerate its methods:

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gopl.io/ch12/methods

// Print prints the method set of the value x.
func Print(x interface{}) {
    v := reflect.ValueOf(x)
    t := v.Type()
    fmt.Printf("type %s\n", t)

    for i := 0; i < v.NumMethod(); i++ {
        methType := v.Method(i).Type()
        fmt.Printf("func (%s) %s%s\n", t, t.Method(i).Name,
            strings.TrimPrefix(methType.String(), "func"))
    }
}

Both reflect.Type and reflect.Value have a method called Method. Each t.Method(i) call returns an instance of reflect.Method, a struct type that describes the name and type of a single method. Each v.Method(i) call returns a reflect.Value ...