Issue #20770 has been updated by AlexandreMagro (Alexandre Magro). lpogic (Łukasz Pomietło) wrote in #note-46:
I wonder if the pipeline operator with assignment wouldn't also be useful in everyday code:
``` ruby str = "ABC" str |>= _.reverse str # => "CBA"
a_simple_json = '{"key":"value"}' a_simple_json |>= JSON.parse _ a_simple_json # => {"key"=>"value"}
a = [{greeting: "Hello"}] a[0][:greeting] |>= "#{_} World!" a # => [{greeting: "Hello World!"}] ```
The pipe operator is well-known, but this type of operation with assignment is something I haven’t seen before, and I’m not sure of its precedence. The examples also don’t illustrate a strong need for it. ```ruby # 1 str = "ABC".reverse # 2 a_simple_json = JSON.parse '{"key":"value"}' ``` In the third example, a dedicated method would be more suitable, I believe a similar proposal was made here: https://bugs.ruby-lang.org/issues/20818 ---------------------------------------- Feature #20770: A *new* pipe operator proposal https://bugs.ruby-lang.org/issues/20770#change-110609 * 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/