Stream: beginners

Topic: Capture rest in list pattern matching?

Sebastian Porto (Dec 14 2022 at 10:32):

Reading about list pattern matching in Roc https://www.roc-lang.org/tutorial#pattern-matching-on-lists

Is it possible to bind the rest to a variable?

when list is
  [a, b, c, d, ..rest] ->

Luke Boswell (Dec 14 2022 at 10:35):

I'm pretty sure that is not supported. I recall it being discussed somewhere, I'll see if I can dig a reference out for you.

Luke Boswell (Dec 14 2022 at 10:37):

Zulip discussion here if you want to read more about it. :smiley:

Luke Boswell (Dec 14 2022 at 10:38):

If your interested the seamless slices is pretty neat, you can also read more about it in Richard's design doc.

Sebastian Porto (Dec 14 2022 at 10:41):

thanks

Last updated: Jul 26 2025 at 12:14 UTC