Add `Hash#fetch_values`; CRuby2.3
@@ -474,4 +474,25 @@ class Hash
end
self
end
+
+ ##
+ # call-seq:
+ # hsh.fetch_values(key, ...) -> array
+ # hsh.fetch_values(key, ...) { |key| block } -> array
+ #
+ # Returns an array containing the values associated with the given keys
+ # but also raises <code>KeyError</code> when one of keys can't be found.
+ # Also see <code>Hash#values_at</code> and <code>Hash#fetch</code>.
+ #
+ # h = { "cat" => "feline", "dog" => "canine", "cow" => "bovine" }
+ #
+ # h.fetch_values("cow", "cat") #=> ["bovine", "feline"]
+ # h.fetch_values("cow", "bird") # raises KeyError
+ # h.fetch_values("cow", "bird") { |k| k.upcase } #=> ["bovine", "BIRD"]
+ #
+ def fetch_values(*keys, &block)
+ keys.map do |k|
+ self.fetch(k, &block)
+ end
+ end
end
