golang拼接字符串性能测试

直接下结论：
bufferTest > plusTest ~= JoinTest > sprintfTest
结果如下：

sprintfTest Run time:  3.4220012s
plusTest Run time:  2.1400019s
bufferTest Run time:  997.4µs
JoinTest Run time:  2.1810023s

贴代码：

package main

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

const number = 100000

func sprintfTest()  {
    var s string
    bT := time.Now()
    for i := 0; i < number; i++ {
        s = fmt.Sprintf("%s%s", s, "hello")
    }
    eT := time.Since(bT)
    fmt.Println("sprintfTest Run time: ", eT)
}

func plusTest()  {
    s := ""
    bT := time.Now()
    for i := 0; i < number; i++ {
        s = s + "hello"
    }
    eT := time.Since(bT)
    fmt.Println("plusTest Run time: ", eT)
}


func bufferTest()  {
    var s bytes.Buffer
    bT := time.Now()
    for i := 0; i < number; i++ {
        s.WriteString("hello")
    }
    eT := time.Since(bT)
    fmt.Println("bufferTest Run time: ", eT)
}

func JoinTest()  {
    s := ""
    bT := time.Now()
    for i := 0; i < number; i++ {
        s = strings.Join([]string {s, "hello"}, "")
    }
    eT := time.Since(bT)
    fmt.Println("JoinTest Run time: ", eT)
}


func main() {
    sprintfTest()
    plusTest()
    bufferTest()
    JoinTest()
}