[ruby-core:92872] [Ruby trunk Feature#15799] pipeline operator

Issue #15799 has been updated by konsolebox (K B).


konsolebox (K B) wrote:
> nobu (Nobuyoshi Nakada) wrote:
> > duerst (Martin Dst) wrote:
> > > As for the assignment, just using parentheses looks confusing to me. It's clear we can't use `>=` or `|=`, but `|>=` or some other combination would be much clearer than just parentheses.
> > 
> > OK, I separated the right-assign to https://github.com/nobu/ruby/tree/feature/rassgn-pipeline,
> > and another operator https://github.com/nobu/ruby/tree/feature/rassgn-funnel.
> 
> `|>=` looks heavy.  Please consider `|:` instead.

Or `=:` which is the reverse of Pascal's assignment operator.  Personally I would want it to have it as an alias to `|:` than replace `|:` because `=:` would look good if it's placed last, but `|:` would look better halfway.

``` ruby
1.. |> take 10 |: ten |> map{ |x| x * 2 } =: doubled
```

My opinion on this new set of operators is that they're good for writing drafts of code quickly because you can easily place an assignment to a variable at the end of a statement, or insert it somewhere, but old-school is better for formal writes since it's more readable.  In old-school assignments, you can easily find where the assignment happens and know when it happens.

----------------------------------------
Feature #15799: pipeline operator
https://bugs.ruby-lang.org/issues/15799#change-78251

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Implemented the pipeline operator `|>`, a topic of "ruby committers vs the world" in RubyKaigi 2019.
Also a casual idea of rightward assignment.

```ruby
1.. |> take 10 |> map {|x| x*2} |> (x)
p x #=> [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
```

https://github.com/nobu/ruby/tree/feature/pipeline




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