reflect-vs-type-assertion-bench.go

package main

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

// benchmarkisPointerTypeAssertion 31.2 ns/op
// MemAllocs: 				  	   39508114
// MemBytes:				  	   315791384

// benchmarkisPointerReflect 	   55.5 ns/op
// MemAllocs: 				  	   43794600
// MemBytes: 				  	   525258872

func main() {
	res := testing.Benchmark(benchmarkisPointerTypeAssertion)
	fmt.Printf("%s\n%#[1]v\n", res)
	fmt.Printf("MemAllocs: %d\n", res.MemAllocs)
	fmt.Printf("MemBytes: %d\n", res.MemBytes)

	res = testing.Benchmark(benchmarkisPointerReflect)
	fmt.Printf("%s\n%#[1]v\n", res)
	fmt.Printf("MemAllocs: %d\n", res.MemAllocs)
	fmt.Printf("MemBytes: %d\n", res.MemBytes)
}

func benchmarkisPointerTypeAssertion(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = isPointerTypeAssertion(strconv.Itoa(i))
	}
}

func benchmarkisPointerReflect(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = isPointerReflect(strconv.Itoa(i))
	}
}

func isPointerTypeAssertion(arg interface{}) bool {
	switch arg.(type) {
	case *string:
		return true
	default:
		return false
	}
}

func isPointerReflect(arg interface{}) bool {
	return reflect.ValueOf(arg).Kind() == reflect.Ptr
}