Best practice of counter in map struct golang

Question

I have a code that is not clean. I want to increment Counter in struct of NameLike but I think this is not effective.

package main

import "fmt"

type NameLike struct {
    Name    string
    Counter int
}

func main() {
    sosmed := make(map[string]NameLike)

    sosmed["rizal"] = NameLike{"Rizal Arfiyan", 10}

    for i := 1; i < 10; i++ {
        sosmed["rizal"] = NameLike{
            Counter: sosmed["rizal"].Counter + 1,
        }
    }

    fmt.Println(sosmed)
}

do you have any ideas regarding this code, to make it clean?

sosmed["rizal"] = NameLike{
    Counter: sosmed["rizal"].Counter + 1,
}

This link for Golang Playground

i have tried it but it have error "cannot assign to struct field sosmed["rizal"].Counter in map" — Rizal Arfiyan, Oct 07 '21 at 15:24
Ah, yea, because it's not addressable. Let me type up a full answer. — sethvargo, Oct 07 '21 at 15:26

score 1 · Accepted Answer · answered Oct 07 '21 at 15:29

There are a few approaches you could take to simplify this code.

The current map passes NameLike by value. If you pass by reference, you can simplify things a bit:

package main

import "fmt"

type NameLike struct {
    Name    string
    Counter int
}

func main() {
    sosmed := make(map[string]*NameLike)
    sosmed["rizal"] = &NameLike{"Rizal Arfiyan", 10}

    for i := 1; i < 10; i++ {
    sosmed["rizal"].Counter++
    }

    fmt.Println(sosmed["rizal"])
}

https://play.golang.org/p/-xvCJyqQ6V0

thank you for helping me – Rizal Arfiyan Oct 07 '21 at 15:35 — Rizal Arfiyan, Oct 07 '21 at 15:35

Best practice of counter in map struct golang

1 Answers1