Luke Boswell (Oct 23 2024 at 01:51): Luke Boswell (Oct 23 2024 at 01:51):What do people (@Richard Feldman) think about including this as a builtin until we have for and var implemented?
# List.roc
forEach! : List a, (a => {}) => {}
forEach! = \l, f! ->
when l is
[] -> {}
[x, .. as xs] ->
f! x
forEach! xs f!
It's really helpful, but non-obvious how to implement.
Luke Boswell (Oct 23 2024 at 01:52):-- with the purity inference change
Richard Feldman (Oct 23 2024 at 01:53):I think it's probably worth having long-term
Richard Feldman (Oct 23 2024 at 01:53):just so you can use it in a pipeline, unlike for
Isaac Van Doren (Oct 23 2024 at 02:02):It would be good to have map! also
Richard Feldman (Oct 23 2024 at 02:02):I'm not sure about that one
Richard Feldman (Oct 23 2024 at 02:03):I mean we definitely could, I'd just rather wait and see if there's actually demand for it in practice
Brendan Hansknecht (Oct 23 2024 at 02:24):In updating wasm4, I hit a handful of instance of needing forEach. I also hit an instance of needing forEachWithIndex
Agus Zubiaga (Oct 23 2024 at 02:27):Yeah, I’m not convinced about map!, but walk! would make sense
Brendan Hansknecht (Oct 23 2024 at 02:31):I mean map! for loading a bunch of files or similar makes sense. Though if possible, I would guess that some sort of mapParallel! would actually be what is wanted.
Brendan Hansknecht (Oct 23 2024 at 02:32):But all of those can be added later.
Brendan Hansknecht (Oct 23 2024 at 02:32):For now, recursion is fine
Brendan Hansknecht (Oct 23 2024 at 02:32):Then when we see enough uses, just add one to the standard
Last updated: Jun 16 2026 at 16:19 UTC