Issue #20770 has been updated by austin (Austin Ziegler). lpogic (Łukasz Pomietło) wrote in #note-36:
What if I need an intermediate result beyond the next step of the method chain?
Cases: ``` ruby def foo r |> q(_) |> p(_) return q_result # "q_result" should be the result of the second step of the chain end ```
``` ruby def foo r |> q(_) |> p(_, r_result) # "r_result" should be the result of the first step of the chain end ```
If you need an intermediate result for any reason, don't use a pipeline, or restructure your return values so that they are returning some sort of context object. In your examples, `#tap` and `#then` would be more useful: ```ruby def foo q(r).tap { p(_1) } end def bar r .then { [_1, q(_1) } .then { |(rr, qr)| p(qr, rr) } end def baz rr = r p(q(rr), rr) end ``` I use the pipe operator in Elixir extensively, but I don't think that I’ve seen a proposal that would really improve Ruby's syntax over `.then { … }` *except* the proposed `.{}` acting as syntax sugar for `.then {…}`. ---------------------------------------- Feature #20770: A *new* pipe operator proposal https://bugs.ruby-lang.org/issues/20770#change-110541 * Author: AlexandreMagro (Alexandre Magro) * Status: Open ---------------------------------------- Hello, This is my first contribution here. I have seen previous discussions around introducing a pipe operator, but it seems the community didn't reach a consensus. I would like to revisit this idea with a simpler approach, more of a syntactic sugar that aligns with how other languages implement the pipe operator, but without making significant changes to Ruby's syntax. Currently, we often write code like this: ```ruby value = half(square(add(value, 3))) ``` We can achieve the same result using the `then` method: ```ruby value = value.then { add(_1, 3) }.then { square(_1) }.then { half(_1) } ``` While `then` helps with readability, we can simplify it further using the proposed pipe operator: ```ruby value = add(value, 3) |> square(_1) |> half(_1) ``` Moreover, with the upcoming `it` feature in Ruby 3.4 (#18980), the code could look even cleaner: ```ruby value = add(value, 3) |> square(it) |> half(it) ``` This proposal uses the anonymous block argument `(_1)`, and with `it`, it simplifies the code without introducing complex syntax changes. It would allow us to achieve the same results as in other languages that support pipe operators, but in a way that feels natural to Ruby, using existing constructs like `then` underneath. I believe this operator would enhance code readability and maintainability, especially in cases where multiple operations are chained together. Thank you for considering this proposal! -- https://bugs.ruby-lang.org/