Thanks everyone for your responses. structs is interesting, but archived,
pre modules even. Using reflect directly also doesn't seem that bad and I
do want error handling, so it looks like nothing beats JSON in terms of UI.
On Mon, May 17, 2021 at 6:22 PM Howard C. Shaw III <howardcs...@gmail.com>
wrote:
> The examples given in other responses are great if you need to handle
> arbitrary or unknown maps and very much fit the 'easy way' part of your
> initial question. But you also asked at the end 'is there a more direct
> way?'.
>
> If you actually know what you are getting, you can code it entirely
> directly:
>
> t := T{
> A: m["a"].(string),
> B: m["b"].(int),
> }
>
> and back again
>
> m2 := map[string]interface{}{}
> m2["a"] = t.A
> m2["b"] = t.B
>
> https://play.golang.org/p/4OY3QoA5Mr3
>
> Why would you not do this? Because your assignment will panic if you pass
> an m that is missing "a" or "b". Not fun. (Something like "panic: interface
> conversion: interface {} is nil, not int") Of course, you can always
> collect the values from the map into temporaries before creating the type
> and handle any nils in that process. Or pass your map through a validation
> step that ensures it is safe to convert before passing it to the conversion.
>
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