Go TypeOf Benchmark

README.md

TypeOf

Original code from https://gist.github.com/mrap/7f08c9549289b6aea2923c27888e7e3e

All Three TypeOf Options

$ go test -bench=. -benchmem
goos: darwin
goarch: amd64
BenchmarkFormatTypeOf-8          11032510               105.0 ns/op           16 B/op          1 allocs/op
BenchmarkReflectTypeOf-8         99367936                12.0 ns/op            0 B/op          0 allocs/op
BenchmarkSwitchTypeOf-8         409517779                 2.9 ns/op            0 B/op          0 allocs/op
PASS
ok      _/Users/runeimp/dev/lang/go/runeimp/src/runeimp/typeof  4.009s

Tests performed with this version of Go

$ go version
go version go1.13.1 darwin/amd64

typeof_test.go

package typeof_test

// Expanded from code found at https://gist.github.com/mrap/7f08c9549289b6aea2923c27888e7e3e
// Expansion was the addition of switchTypeOf and BenchmarkSwitchTypeOf

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

type T struct{}

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

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

func switchTypeOf(v interface{}) string {
	switch v.(type) {
	case struct{}:
		return "struct"
	default:
		return "unknown"
	}
	return "unknown"
}

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

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

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