[#92063] [Ruby trunk Misc#15723] Reconsider numbered parameters — zverok.offline@...
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3 messages
2019/03/31
[ruby-core:91924] [Ruby trunk Feature#15722] `Kernel#case?`
From:
sawadatsuyoshi@...
Date:
2019-03-22 07:12:32 UTC
List:
ruby-core #91924
Issue #15722 has been reported by sawa (Tsuyoshi Sawada).
----------------------------------------
Feature #15722: `Kernel#case?`
https://bugs.ruby-lang.org/issues/15722
* Author: sawa (Tsuyoshi Sawada)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
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I often want to use `===` to match a single object on the right side against multiple objects on the left, as is used in `case`-constructions, just to return a truth value, and end up writing like this:
```ruby
bar # => "bar"
flag1 = case bar; when "foo", "bar", "baz"; true; end # => true
flag2 = case bar; when Symbol, String; true; end # => true
```
I propose `Kernel#case?` that should work like this:
```ruby
bar # => "bar"
bar.case?("foo", "bar", "baz") # => true
bar.case?("qux") # => false
bar.case?(Symbol, String) # => true
bar.case?(Array) # => false
bar.case? # => false
```
It is similar to Rails' `in?`, but it differs from it in that it uses `===` for comparison, not `==`.
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