[#89806] [Ruby trunk Bug#15306] Generate prelude.c using miniruby — v.ondruch@...
Issue #15306 has been reported by vo.x (Vit Ondruch).
3 messages
2018/11/15
[ruby-core:89908] [Ruby trunk Feature#15323] [PATCH] Proposal: Add Enumerable#filter_map
From:
tonysunnymails@...
Date:
2018-11-20 14:29:55 UTC
List:
ruby-core #89908
Issue #15323 has been updated by tny (Tony Sunny).
Could't we use reduce for this?
~~~ ruby
(1..10).reduce([]) { |a, i| i.even? ? a << i : a }
~~~
----------------------------------------
Feature #15323: [PATCH] Proposal: Add Enumerable#filter_map
https://bugs.ruby-lang.org/issues/15323#change-74990
* Author: alfonsojimenez (Alfonso Jim辿nez)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
----------------------------------------
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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