ruby-core

Issue #15323 has been updated by jonathanhefner (Jonathan Hefner).


nobu (Nobuyoshi Nakada) wrote:
> IIRC, at the last meeting (20190522), the conclusion was that this method should select non-nil values only, like as `Array#compact`.
> Am I correct?

Checking master, it looks like this was not addressed.  I agree it would be more intuitive for `filter_map` to behave like `map{ ... }.compact`.  Rejecting `false` values seems like a "gotcha" / footgun.

I have submitted a PR: https://github.com/ruby/ruby/pull/2530


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Feature #15323: [PATCH] Proposal: Add Enumerable#filter_map
https://bugs.ruby-lang.org/issues/15323#change-81925

* Author: alfonsojimenez (Alfonso Jim駭ez)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
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This is a proposal for a combined `filter` + `map` method (https://bugs.ruby-lang.org/issues/5663).

This method both filters and maps the elements of an enumerable in just one iteration:

~~~ ruby
(1..10).filter_map { |i| i * 2 if i.even? } #=> [4, 8, 12, 16, 20]
~~~

GitHub PR: https://github.com/ruby/ruby/pull/2017


 

---Files--------------------------------
0001-Adding-Enumerable-filter_map.patch (4.61 KB)


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