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Feature #10017

Updated by nobu (Nobuyoshi Nakada) over 4 years ago

I'm proposing to add a new method `Hash#values_at!` that's basically a combination of `#values_at` and `#fetch`.

When dealing with configuration I prefer to use `#fetch` to fail early and this would be useful to read multiple keys at a time.
An example (not strictly on a Hash, but you get the idea) could be:

```ruby ```
repo, token = ENV.values_at!('GITHUB_REPO', 'GITHUB_TOKEN')

ENV.values_at!('INVALID') # raises KeyError

# not sure if that useful, but I provide it here for the sake of completeness
ENV.values_at!("SHELL", "INVALID") { |k| k + " is missing" } # => ["/bin/bash", "INVALID is missing"]
```

Another name for this could be `#fetch_at`, perhaps.

P.S. I'm attaching a patch that was done using mostly trial and error

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