[ruby-core:95681] [Ruby master Feature#15323] [PATCH] Proposal: Add Enumerable#filter_map
From:
shevegen@...
Date:
2019-11-04 21:35:48 UTC
List:
ruby-core #95681
Issue #15323 has been updated by shevegen (Robert A. Heiler).
Actually, after rereading what Jonathan wrote, he referred not to "true" values
per se, but as to whether "non nil values" are to be included. So perhaps I
misunderstood his comment. I think that filter still applies to the .select
and should return what matches to the given criterium, so from this point of
view I understand Jonathan's confusion. Either way I think it is best to
define this clearly.
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Feature #15323: [PATCH] Proposal: Add Enumerable#filter_map
https://bugs.ruby-lang.org/issues/15323#change-82468
* 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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