[#106341] [Ruby master Bug#18369] users.detect(:name, "Dorian") as shorthand for users.detect { |user| user.name == "Dorian" } — dorianmariefr <noreply@...>
Issue #18369 has been reported by dorianmariefr (Dorian Mari辿).
14 messages
2021/11/30
[#106351] [Ruby master Bug#18371] Release branches (release information in general) — "tenderlovemaking (Aaron Patterson)" <noreply@...>
Issue #18371 has been reported by tenderlovemaking (Aaron Patterson).
7 messages
2021/11/30
[ruby-core:106312] [Ruby master Feature#18366] Enumerator#return_eval
From:
"Eregon (Benoit Daloze)" <noreply@...>
Date:
2021-11-29 14:00:33 UTC
List:
ruby-core #106312
Issue #18366 has been updated by Eregon (Benoit Daloze).
I would advise against making Enumerable methods more complex with additional arguments, it'll only make them slower or more complicated to JIT compile, in addition to making their role less clear.
How would `return_eval` work? Could you write it in Ruby or as pseudo-code?
----------------------------------------
Feature #18366: Enumerator#return_eval
https://bugs.ruby-lang.org/issues/18366#change-94940
* Author: sawa (Tsuyoshi Sawada)
* Status: Open
* Priority: Normal
----------------------------------------
Some `Enumerable` methods return one or more of the receiver's elements according to the return value of a block it takes. Often, we want such evaluated value rather than the original element.
For example, suppose we want to know the character width sufficient to fit all the strings in an array:
```ruby
a = ["Hello", "my", "name", "is", "Ruby"]
```
We either have to repeat the evaluation of the block:
```ruby
a.max_by(&:length).length # => 5
```
or create a temporal array:
```ruby
a.map(&:length).max # => 5
```
both of which seem not to be optimal.
I propose to have a method `Enumerator#return_eval` that returns the evaluated value(s) of the block:
```ruby
a.max_by.return_eval(&:length) # => 5
a.min_by.return_eval(&:length) # => 2
a.minmax_by.return_eval(&:length) # => [2, 5]
["Ava Davidson", "Benjamin Anderson", "Charlie Baker"]
.sort_by.return_eval{_1.split.reverse.join(", ")} # => ["Anderson, Benjamin", "Baker, Charlie", "Davidson, Ava"]
```
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