Michael “Rosy” Luder-Rosefield (Feb 27 2025 at 00:48): Michael “Rosy” Luder-Rosefield (Feb 27 2025 at 00:48):Hi all
First thing I need to ask is: what is going on with lambdas? They are sprinkled throughout the tutorial, without ever actually being formally introduced, but \... ->... seems essentially equivalent to |...| ... / |...| {...}; I'm not sure if one form is newer and becoming normalised, or if there are different use-cases for them.
Secondly, there does seem to be a move to make List concatenation simpler with .. spread syntax, but (coming from a JS background), my impulse is that this should be unified with the record-making syntax & .
Thirdly, I like that many infix operators are just syntax sugar for functions. Are there any plans for making custom operators? (EDIT: found some pushback against that idea, which, fair enough :-D )
Or, perhaps, converting from operators back to their functions? The pipe operator already does the converse (Num(a,b) == a / b == a |> Num.div b), which is like the use of backticks in Haskell. First thought is: Num.div could be same as (/): Num.div(a,b) == (/)(a,b)
Oh, and fourth, sorry: I have been bouncing off the docs for the RecordBuilder, with its <- syntax. And I just remembered that the language used to have 'backpassing' with the same operator. Is this backpassing, or something else?
Luke Boswell (Feb 27 2025 at 01:22):First thing I need to ask is: what is going on with lambdas?
The old syntax was \ and the new is |..|
Luke Boswell (Feb 27 2025 at 01:23):Are there any plans for making custom operators?
The plan is to remove Abilities in favour of Static Dispatch -- so we have implicit interfaces and the operators are just sugar for those. I'll dig out the thread and link it here.
Luke Boswell (Feb 27 2025 at 01:24):
Luke Boswell (Feb 27 2025 at 01:25):Is this backpassing, or something else?
It's just the syntax for a building a RecordBuilder. The inspiration came from backpassing operator <- but unrelated.
Luke Boswell (Feb 27 2025 at 01:27):there does seem to be a move to make
Listconcatenation simpler with..spread syntax
Have you seen these issues? https://github.com/roc-lang/roc/issues/7091
Maybe that helps you with some additional context?
Last updated: Jul 26 2025 at 12:14 UTC