字符串拼接效率

...

from  https://blog.csdn.net/m0_37422289/article/details/103362740

append 的最快

package main

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

type Enet_smp_domain_map struct {
    // gorm.Model
    Id           uint `gorm:"primary_key;auto_increment;not null"`
    Domain_name  string
    Domain_ip    string
    Domain_count uint
    CreatedAt    time.Time
}

var loop = 100000

func main() {
    // db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
    // if err != nil {
    //     panic("failed to connect database")
    // }

    // db.AutoMigrate(&Enet_smp_domain_map{})

    // db.Create(&Enet_smp_domain_map{Domain_name: "app.baidu.com", Domain_ip: "1.1.1.1", Domain_count: 3305})
    // db.Create(&Enet_smp_domain_map{Domain_name: "app.baidu.com", Domain_ip: "1.1.10.1", Domain_count: 3305})
    // db.Create(&Enet_smp_domain_map{Domain_name: "app.baidu.com", Domain_ip: "1.1.11.1", Domain_count: 3305})

    var s string
    s1 := "hello"
    s2 := "world"
    var start time.Time
    //加号+连接
    start = time.Now()
    for i := 0; i < loop; i++ {
        s1 += s2
    }
    fmt.Println("+连接方法:", time.Since(start))
    //append连接
    s1 = "hello"
    s2 = "world"
    start = time.Now()
    for i := 0; i < loop; i++ {
        s = string(append([]byte(s1), s2...))
    }
    fmt.Println("append方法:", time.Since(start))
    //Join方法连接
    v := []string{"hello", "world"}
    start = time.Now()
    for i := 0; i < loop; i++ {
        s = strings.Join(v, "")
    }
    fmt.Println("strings.Join方法:", time.Since(start))
    //bytes.writestring方法
    start = time.Now()
    for i := 0; i < loop; i++ {
        var buf bytes.Buffer
        buf.WriteString("hello")
        buf.WriteString("world")
        buf.String()
    }
    fmt.Println("bytes.writestring方法:", time.Since(start))
    //fmt方法连接
    start = time.Now()
    for i := 0; i < loop; i++ {
        s = fmt.Sprintf("%s%s", "hello", "world")
    }
    fmt.Println("fmt方法:", time.Since(start))
    fmt.Println(s)
}