comma.go

package comma

import (
	"fmt"
	"strings"
)

func Add(one, two string) string {
	return one + "," + two
}

func Join(one, two string) string {
	return strings.Join([]string{one, two}, ",")
}

func Fmt(one, two string) string {
	return fmt.Sprintf("%s,%s", one, two)
}

comma_test.go

package comma

import "testing"

//Uses advice from: http://dave.cheney.net/2013/06/30/how-to-write-benchmarks-in-go

var global string

func benchmarkAdd(b *testing.B, one, two string) {
	var g string
	for n := 0; n < b.N; n++ {
		g = Add(one, two)
	}
	global = g
}

func benchmarkJoin(b *testing.B, one, two string) {
	var g string
	for n := 0; n < b.N; n++ {
		g = Join(one, two)
	}
	global = g
}

func benchmarkFmt(b *testing.B, one, two string) {
	var g string
	for n := 0; n < b.N; n++ {
		g = Fmt(one, two)
	}
	global = g
}

func BenchmarkAddShort(b *testing.B)  { benchmarkAdd(b, "a", " a") }
func BenchmarkJoinShort(b *testing.B) { benchmarkJoin(b, "a", " a") }
func BenchmarkFmtShort(b *testing.B)  { benchmarkFmt(b, "a", " a") }

func BenchmarkAddLong(b *testing.B) {
	benchmarkAdd(b, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz", " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
}
func BenchmarkJoinLong(b *testing.B) {
	benchmarkJoin(b, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz", " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
}
func BenchmarkFmtLong(b *testing.B) {
	benchmarkFmt(b, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz", " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
}

func BenchmarkAddShortLong(b *testing.B) {
	benchmarkAdd(b, "a", " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
}
func BenchmarkJoinShortLong(b *testing.B) {
	benchmarkJoin(b, "a", " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
}
func BenchmarkFmthortLong(b *testing.B) {
	benchmarkFmt(b, "a", " abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
}