1 files changed, 44 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/array_inquirer.rb b/activesupport/lib/active_support/array_inquirer.rb
new file mode 100644
index 0000000000..f59ddf5403
--- /dev/null
+++ b/activesupport/lib/active_support/array_inquirer.rb
@@ -0,0 +1,44 @@
+module ActiveSupport
+  # Wrapping an array in an +ArrayInquirer+ gives a friendlier way to check
+  # its string-like contents:
+  #
+  #   variants = ActiveSupport::ArrayInquirer.new([:phone, :tablet])
+  #
+  #   variants.phone?    # => true
+  #   variants.tablet?   # => true
+  #   variants.desktop?  # => false
+  class ArrayInquirer < Array
+    # Passes each element of +candidates+ collection to ArrayInquirer collection.
+    # The method returns true if at least one element is the same. If +candidates+
+    # collection is not given, method returns true.
+    #
+    #   variants = ActiveSupport::ArrayInquirer.new([:phone, :tablet])
+    #
+    #   variants.any?                      # => true
+    #   variants.any?(:phone, :tablet)     # => true
+    #   variants.any?('phone', 'desktop')  # => true
+    #   variants.any?(:desktop, :watch)    # => false
+    def any?(*candidates, &block)
+      if candidates.none?
+        super
+      else
+        candidates.any? do |candidate|
+          include?(candidate.to_sym) || include?(candidate.to_s)
+        end
+      end
+    end
+
+    private
+      def respond_to_missing?(name, include_private = false)
+        name[-1] == '?'
+      end
+
+      def method_missing(name, *args)
+        if name[-1] == '?'
+          any?(name[0..-2])
+        else
+          super
+        end
+      end
+  end
+end