[#105450] [Ruby master Feature#18228] Add a `timeout` option to `IO.copy_stream` — "byroot (Jean Boussier)" <noreply@...>
Issue #18228 has been reported by byroot (Jean Boussier).
11 messages
2021/09/27
[ruby-core:105112] [Ruby master Feature#18135] Introduce Enumerable#detect_only
From:
"mame (Yusuke Endoh)" <noreply@...>
Date:
2021-09-02 00:31:09 UTC
List:
ruby-core #105112
Issue #18135 has been updated by mame (Yusuke Endoh).
Do you mean `raise if matches.size != 1` instead of `... != 0`?
The idea of `take_only` is already proposed in #13683.
----------------------------------------
Feature #18135: Introduce Enumerable#detect_only
https://bugs.ruby-lang.org/issues/18135#change-93524
* Author: meisel (Michael Eisel)
* Status: Open
* Priority: Normal
----------------------------------------
It can be important to get the only element for which a block returns true, and to assert that this is the only element as such. For example, this can be a very helpful sanity check when one is working with data that's outside of their control and is not perfectly understood. They may have a guess as to how to get a specific element matching some criteria, but if they used Enumerable#detect might be hiding the fact that they have written an incorrect block and that there's in fact more than one element that matches it. It could also be a parameter on Typically, I'd do it like this:
```
matches = array.select { |elem| some_method(elem) }
raise if matches.size != 0
match = matches.first
```
Here, it would be shortened to:
```
match = array.detect_only { |elem| some_method(elem) }
```
It could also be a parameter on Enumerable#detect instead of a separate method.
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