bench_test.go

package main_test

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

var (
	prefix = "abcdefghi:"
	id     = 123456
)

func BenchmarkSprintPlus(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = prefix + fmt.Sprintf("%d", id)
	}
}

func BenchmarkSprintOnly(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = fmt.Sprintf("%s%d", prefix, id)
	}
}

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

func BenchmarkFormatInt(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = prefix + strconv.FormatInt(int64(id), 10)
	}
}

// goos: darwin
// goarch: amd64
// BenchmarkSprintPlus-4            8625607               123 ns/op              16 B/op          2 allocs/op
// BenchmarkSprintOnly-4            6326647               168 ns/op              40 B/op          3 allocs/op
// BenchmarkItoa-4                 23701102                49.4 ns/op             8 B/op          1 allocs/op
// BenchmarkFormatInt-4            23848172                48.8 ns/op             8 B/op          1 allocs/op