Testing different runtime reflections in golang

reflections.go

// Testing different runtime reflections in golang
// See "The Laws of Reflection" for an introduction
// to reflection in Go: http://golang.org/doc/articles/laws_of_reflection.html

package main

import (
	"fmt"
	"reflect"
)

type TypeA struct {
	Id     int
	FieldA string `tag: "field_a"`
}

func main() {
	fmt.Println("For a pointer..")
	ptr := &TypeA{1, "someval"}
	displayReflection(ptr)

	fmt.Println("\nFor a non pointer..")
	val := TypeA{1, "someval"}
	displayReflection(val)
}

func displayReflection(s interface{}) {
	// ValueOf returns the concrete value
	// stored in the interface
	value := reflect.ValueOf(s)
	sType := reflect.TypeOf(s)
	fmt.Println("Kind of s:", value.Kind())
	fmt.Println("Type of s:", sType)

	// Elem returns the value that the interface s
	// contains or that the pointer s points to
	if value.Kind() == reflect.Ptr {
		value = value.Elem()
		fmt.Println("Kind of s elements:", value.Kind())
	}

	fmt.Println("Iterating on fields..")
	for i := 0; i < value.NumField(); i++ {
		field := value.Field(i)
		fmt.Println(" Field:", i)
		fmt.Println("   Name:", value.Type().Field(i).Name)
		fmt.Println("   Tags:", value.Type().Field(i).Tag)
		fmt.Println("   Kind:", field.Kind())
		fmt.Println("  Value:", field)
	}
}

To run the above:

$ go run $(o=/tmp/rfl.go;curl -sLo $o https://gist.githubusercontent.com/gosuri/011383e88ea1bce67bd8/raw/17c4d4a080955c4fe5b05a8c206a279bffdb5d39/reflections.go; echo $o)