[ruby-core:93133] [Ruby trunk Feature#15799] pipeline operator

Issue #15799 has been updated by matz (Yukihiro Matsumoto).


Unlike JavaScript and Python (Lisp-1 like languages), Ruby is a Lisp-2 like language, in which methods and variable have separated namespaces. In Lisp-1 like languages, `f1 = function; f1()` calls `function` (single namespace).

In a Lisp-2 like language, ordinary (Elixir like) pipeline operator does not work, because it's harder to retrieve a method object in the language. Besides that, the receiver of Ruby methods can be considered as the first argument. So
```
a |> method1() |> method2() # or a.method1().method2()
```
can be considered as
```
method2(method1(a))
```
in other languages. So calling it a pipeline operator is not that out scoped.

Maybe we should call it a **chaining operator** and replace different combination of characters (`>>>` for example?) to avoid confusion.

Matz.


----------------------------------------
Feature #15799: pipeline operator
https://bugs.ruby-lang.org/issues/15799#change-78562

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* 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 {|e| e*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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