On Sat, Feb 25, 2017 at 9:58 PM, Ayan George <a...@ayan.net> wrote:
>
>
> On 02/25/2017 03:48 AM, Amit Saha wrote:
>>
>> I think both these approaches are fine, but just wanted to check.
>>
>
> tl;dr: I think the second example is the way to go.
>
> I'm somewhat new to Golang so please someone correct me if I'm wrong.
>
> Neither of your examples are closures and, AFAIK, they're both
> effectively the same. As Jan mentioned -- if you actually used a
> closure like below, there *would* be a data race:
>
> func main() {
> slice := []int{1, 23, 100, 101}
> for _, val := range slice {
> go func() {
> fmt.Printf("val = %d\n", val)
> }()
> }
> }
>
Thanks for the reply. Yes, I have learned the same about issues with
closures. Yes. indeed, my example #1 is using an anonymous function,
not a closure. Jan mentioned though #2 has a race, and that got me
confused.
> Notice the goroutines access the same 'val' variable concurrently
> while 'val' changes.
>
> I don't think your code presents a race because it copies 'val' when it
> is passed as a parameter to printme() or to your anonymous function.
>
> I think the choice to use an anonymous function and the choice to use a
> closure have their own considerations.
>
> You typically choose to use an anonymous function if the code
> you want to execute is relatively short and if the code is something
> that you don't plan to re-use.
>
> Your example is short but it is only one statement so wrapping it in an
> anonymous function doesn't buy you anything. If it were two or three
> statements I think it'd be worthwhile.
Indeed, that makes sense. Thank you.
>
> -ayan
>
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