高效地拼接字符串- go

对比结果：

BenchmarkAdd-4                36          31375864 ns/op        215482269 B/op     10005 allocs/op
BenchmarkFmt-4                37          29228970 ns/op        159060782 B/op     30145 allocs/op
BenchmarkJoin-4            15288             77334 ns/op           40960 B/op          1 allocs/op
BenchmarkBuffer-4          18453             65148 ns/op           98240 B/op         11 allocs/op
BenchmarkBuild-4           18283             63780 ns/op          154360 B/op         20 allocs/op
PASS
ok      string  10.122s　　　

代码：

package main

import (
	"bytes"
	"fmt"
	"strings"
)

var stringArray []string

func main() {
	// s := AddMethd()
	s := fmtMethod()
	fmt.Printf("%v\n", s)
}

func init() {
	setString(10000, "ABC")
}

func setString(n int, s string) {
	fmt.Println("执行初始化字符串数组")
	for i := 0; i <= n; i++ {
		stringArray = append(stringArray, s)

	}
}

func AddMethd() (s string) {
	for _, v := range stringArray {
		s += v + ","
	}
	return
}

func fmtMethod() (s string) {

	for _, v := range stringArray {
		s = fmt.Sprintf("%s%s", s, v)
	}

	return
}

func joinMethod() (s string) {
	s = strings.Join(stringArray, ",")
	return
}

func bufferMethod() (s string) {
	var b bytes.Buffer
	for _, v := range stringArray {
		b.WriteString(v)
	}
	s = b.String()
	return
}

func builderMethod() (s string) {
	var b strings.Builder
	for _, v := range stringArray {
		b.WriteString(v)
	}
	s = b.String()
	return
}