proposal-flatMap VS es1995

If you're doing a series of mutations specific to a custom type in that fashion, then there isn't much benefit. But imagine you want to chain operations on an existing type, whether it's a built-in like String, or a type introduced by a different package like sqlite.Database. To use method chaining you'd have to monkey-patch them, which can lead to all sorts of problems: colliding with other packages that want to monkey-patch the same types, confusing the reader when unfamiliar and seemingly undocumented methods appear (why does the SQLite documentation not mention this sqlite.Database#drop method? Which of my installed packages added that? ), your package breaking when the thing you're monkey-patching changes its API, altering object iterations, etc. The troubles with Prototype.js and MooTools in the '00s showed some of the headaches monkey-patching can lead to when it comes to JS especially, where users expect ever-changing browsers to work with 25-year-old code. (I still support changing flatten to smoosh, though.) You might subclass the existing type or encapsulate it in a new type, but then you're potentially breaking the user's typechecking, preventing the use of any other packages that want to do the same thing, escaping tree shaking, and becoming incompatible with unexpected types (what if the user already subclassed sqlite.Database themselves, and want to apply your transformation to that?).

> The API matters, and readability matters.

Exactly, lodash should be part of the language. https://github.com/mlajtos/es1995

Yes, https://github.com/mlajtos/es1995

> It made the decision to extend prototypes. In hindsight, a huge mistake.

I think it was a mistake at the time, but I still believe prototypal inheritance is pretty great idea. And JS desperately needs standard library, which IMO should extend built-in prototypes, so the language would be more coherent. ES1995 [0] was a funny take on this direction, but people (mainly non-JS people) would like to seriously use it. Go figure.

[0]: https://github.com/mlajtos/es1995

(I was trying out some old school way with ES1995. I might rewrite it to TS one day.)

ES1995 agrees.

Thanks! I think we share a few aesthetic ideals :) I really like your work on L1 and New Kind of Paper, and just noticed ES1995 – if only it was true…