golang字符串拼接性能对比

对比 +（运算符）、strings.Join、sprintf、bytes.Buffer对字符串拼接的性能

package main

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

func TestfourPlusFour(t *testing.T) {
	fmt.Println("testing")
}

func BenchmarkAddStringWithOperator(b *testing.B) {
	hello := ""
	for i := 0; i < b.N; i++ {
		hello += "hellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohello"
	}
}

func BenchmarkAddStringWithSptint(b *testing.B) {
	hello := ""
	for i := 0; i < b.N; i++ {
		hello = fmt.Sprintf("%s%s", hello, "hellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohello")
	}
}

func BenchmarkAddStringWithJoin(b *testing.B) {
	hello := ""
	for i := 0; i < b.N; i++ {
		hello = strings.Join([]string{hello, "hellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohello"}, "")
	}
}

func BenchmarkAddStringWithBuffer(b *testing.B) {
	var buf bytes.Buffer
	for i := 0; i < b.N; i++ {
		buf.WriteString("hellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohellohello")
	}
	_ = buf.String()
}

　　运行测试结果：

在一些性能要求较高的场合，尽量使用buf.WriteString()以获得较好的可读性