2023-05-06 12:55 GMT+02:00, Olle Härstedt <olleharst...@gmail.com>:
> Heyo internalitos,
>
> I was thinking of having the possibility to use `readonly` (or any
> other keyword) to make a function argument behave as if it was a
> readonly object.
>
> class Point
> {
> public int $x;
> public int $y;
> }
> function doThing(readonly Point $p)
> {
> $p->x = 10; // Not allowed
> }
>
> In C# it's called in/out/ref types:
> https://www.pluralsight.com/guides/csharp-in-out-ref-parameters
>
> The main use-case is to not give away more access than you have to,
> and being able to state your intent in the function signature.
>
> Another alternative would be to allow properties in interfaces, and
> then define a readonly-like interface:
>
> interface ReadonlyPoint
> {
> public readonly int $x;
> public readonly int $y;
> }
> function doThing(ReadonlyPoint $p)
> {
> $p->x = 10; // Not allowed
> }
>
> No idea about practical feasability.
>
> Since arrays are value types, they're not really relevant for this
> suggestion. Same goes for string, int, etc.
>
> Regards
> Olle
Also related is Object.freeze from JS (I was told):
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
Olle
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