Issue #20770 has been updated by AlexandreMagro (Alexandre Magro). austin (Austin Ziegler) wrote in #note-40:
Ruby already *has* pipeline-like method, `#then`. If `|>` or `.{}` acts as syntactic sugar for `#then`, I don't see an issue here. If, internally, it’s turned into the effective equivalent of `__pipe1 = r; __pipe2 = q(__pipe1); __pipe3 = p(__pipe2); __pipe3`, I don't see an issue here. But under no circumstances do I think that the effective temporary assignments should be exposed or made available to method calls further down the pipeline or after the pipeline is complete. That's too much magic.
I agree with your point. It would indeed be “healthier” not to expose assignments made within the pipeline, as this could be handled as an exception, though I think it might depend on specific implementation details. However, it’s possible to do this with `.then`: ```ruby def bar r .then { [_1, q(_1)] } # <= keeping q(_1) value as _1[1] .then { |(rr, qr)| p(qr, rr) } end ``` Or ```ruby x = 5 y = nil x.then { y = x * 100 } # Here `y` should be previously defined y # => 500 ``` ---------------------------------------- Feature #20770: A *new* pipe operator proposal https://bugs.ruby-lang.org/issues/20770#change-110558 * 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/