alt Hacker News> But the default expectation (and therefore the design) should follow the practices of the language. If JS allows mutations on the objects passed to a function to be reflected on the parent, I believe frameworks should follow this paradigm.
Why? Why should frameworks be beholden to the mutation semantics of the language, particularly with JS where there is no choice of language in the browser? Why should frameworks follow this paradigm?
Because JavaScript _is_ the language and people know it. I never understood the concept of a "React developer", for example, although I saw many junior devs who were very well-versed in React and didn't completely understand JavaScript.
In the end, it's a design choice. Of course frameworks don't inherently _need_ to be beholden to the standards of the underlying language, but I think this is just simpler, therefore a worthy goal to pursue.