Benchmarks for getting object type in go. http://stackoverflow.com/a/27160765/2078664

results.md

go test -bench=. -benchmem

BenchmarkTypeof-4          	10000000	       153 ns/op	      16 B/op	       1 allocs/op
BenchmarkReflectTypeOf-4   	50000000	        27.4 ns/op	       0 B/op	       0 allocs/op
PASS
ok  	github.com/mrap/bench/typeof	3.099s

typeof_test.go

package typeof_test

import (
	"fmt"
	"reflect"
	"testing"
)

type T struct {
}

func typeof(v interface{}) string {
	return fmt.Sprintf("%T", v)
}

func reflectTypeof(v interface{}) string {
	return reflect.TypeOf(v).String()
}

func BenchmarkTypeof(b *testing.B) {
	var v T
	for i := 0; i < b.N; i++ {
		typeof(v)
	}
}

func BenchmarkReflectTypeOf(b *testing.B) {
	var v T
	for i := 0; i < b.N; i++ {
		reflectTypeof(v)
	}
}