遍历数组的更干净方法+从值创建字符串

Question

With this code, is there a better way to loop through all the users and create a new string containing all their Nick values?

package main

import "fmt"

type User struct {
    Nick     string
}


func main() {
    var users [2]User
    users[0] = User{ Nick: "Radar" }
    users[1] = User{ Nick: "NotRadar" }
    names := ":"
    for _, u := range users {
        names += u.Nick + " "
    }
    fmt.Println(names)

}

Answer 1

It really looks like you want a strings.Join here. You probably want to avoid that tight loop of repeated string concatenations in the original code; I'm fairly certain that Go doesn't implement a rope-like data structure for its primitive strings.

package main

import (
    "fmt"
    "strings"
)

type User struct {
    Nick string
}

func main() {
    var users [2]User
    users[0] = User{Nick: "Radar"}
    users[1] = User{Nick: "NotRadar"}
    userNames := []string{}
    for _, u := range users {
        userNames = append(userNames, u.Nick)
    }
    names := ":" + strings.Join(userNames, " ")
    fmt.Println(names)
}