From: sawadatsuyoshi@... Date: 2019-03-22T16:26:00+00:00 Subject: [ruby-core:91942] [Ruby trunk Feature#15722] `Kernel#case?` Issue #15722 has been updated by sawa (Tsuyoshi Sawada). If such method, if any, should be rather defined on `Object`, that would be fine. I was not sure whether I should have requested this for `Kernel` or for `Objecr`. ---------------------------------------- Feature #15722: `Kernel#case?` https://bugs.ruby-lang.org/issues/15722#change-77274 * Author: sawa (Tsuyoshi Sawada) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- 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 `==`. -- https://bugs.ruby-lang.org/ Unsubscribe: