[#108552] [Ruby master Bug#18782] Race conditions in autoload when loading the same feature with multiple threads. — "ioquatix (Samuel Williams)" <noreply@...>
Issue #18782 has been reported by ioquatix (Samuel Williams).
11 messages
2022/05/14
[ruby-core:108579] [Ruby master Feature#14602] Version of dig that raises error if a key is not present
From:
"shyouhei (Shyouhei Urabe)" <noreply@...>
Date:
2022-05-17 08:04:28 UTC
List:
ruby-core #108579
Issue #14602 has been updated by shyouhei (Shyouhei Urabe).
mame (Yusuke Endoh) wrote in #note-14:
> shyouhei (Shyouhei Urabe) wrote in #note-13:
> > Doesn't interface with Arrays.
>
> `[0, 0, 0].inject([[[:foo]]], :fetch) #=> :foo` ?
>
> I don't think @nobu is serious about the idiom, though.
Hmm, sorry. I was confusing.
----------------------------------------
Feature #14602: Version of dig that raises error if a key is not present
https://bugs.ruby-lang.org/issues/14602#change-97616
* Author: amcaplan (Ariel Caplan)
* Status: Open
* Priority: Normal
----------------------------------------
Currently, if I have a hash like this:
~~~ ruby
{
:name => {
:first => "Ariel",
:last => "Caplan"
}
}
~~~
and I want to navigate confidently and raise a KeyError if something is missing, I can do:
~~~ ruby
hash.fetch(:name).fetch(:first)
~~~
Unfortunately, the length of the name, combined with the need to repeat the method name every time, means most programmers are more likely to do this:
~~~ ruby
hash[:name][:first]
~~~
which leads to many unexpected errors.
The Hash#dig method made it easy to access methods safely from a nested hash; I'd like to have something similar for access without error protection, and I'd think the most natural name would be Hash#dig!. It would work like this:
~~~ ruby
hash = {
:name => {
:first => "Ariel",
:last => "Caplan"
}
}
hash.dig!(:name, :first) # => Ariel
hash.dig!(:name, :middle) # raises KeyError (key not found: :middle)
hash.dig!(:name, :first, :foo) # raises TypeError (String does not have #dig! method)
~~~
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