Concatenate strings in "golang"

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Introduction

When I begun entering golang code bases with developers of various seniority levels, I was surprised to see many ways of doing join strings. Making "onetwo" out of one and two is used a lot in any programming language.

I decided to do a quick benchmark. Comming from the C/C++ world, the result in golang surprized me (in a good way).

The origin

Let's do it in a C maner using Sprintf.

I use pointers here to simulate the fact that we are in a function.

#include <stdlib.h>
#include <stdio.h>

int main(){
    char str[] = "my_string";
    char *s = malloc(sizeof(str) + sizeof(str));
    sprintf(s, "my_string%s", str);
    printf("%s\n", s);
}

Let's go golang

Let's do like in C. This was (at least when I begin with golang) a instinctive way for me.

package main

import "fmt"

func main() {
    str := "my_string"
    fmt.Println(fmt.Sprintf("my_string%s", str))
}

Let's try an other way strings.Join

Discussing with others I realize that strings.Join is quite popular.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "my_string"
    fmt.Println(strings.Join([]string{"my_string", str}, ""))
}

Let's try C++ way using strings.Builder

Having experienced string builder in C++ and Java I thought I could give it a try.

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "my_string"
    var b strings.Builder
    b.WriteString("my_string")
    b.WriteString(str)
}

Let's try Cpp way using +

Plus is kind of obvious but does not feel smart.

package main

import "fmt"

func main() {
    str := "my_string"
    fmt.Println("my_string" + str)
}

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