Issue #15145 has been reported by koenhandekyn (koen handekyn).

----------------------------------------
Bug #15145: chained mappings proposal
https://bugs.ruby-lang.org/issues/15145

* Author: koenhandekyn (koen handekyn)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
propsal, have map accept array of method references to make chained mapping simpler  with suggestion to implement it to behave like the &. operator so that intermediate nil values just ripple through as nil values

as alternative to (with important remark is that if first or second mapping returns nil values the above code will break, forcing a much more verbose notation)

~~~ ruby
collection.map(&:instrument).map(&:issuer).map(&:name)
~~~

equivalent to

~~~ ruby
collection.map { |e| e&.instrument }.map { |e| e&.issuer }.map { |e| e&.name }
~~~

proposal allow

~~~ ruby
collection.map(&:instrument, &:issuer, &:name)
~~~

implementation is trivial 





-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>