From 44f07045d186b2065103c4095b3a2fe56e3964b5 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 18 Oct 2017 10:05:39 +0900
Subject: Add `Hash#fetch_values`; CRuby2.3

---
 mrbgems/mruby-hash-ext/mrblib/hash.rb | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/mrbgems/mruby-hash-ext/mrblib/hash.rb b/mrbgems/mruby-hash-ext/mrblib/hash.rb
index 73d1fbe6d..7bf06a0ad 100644
--- a/mrbgems/mruby-hash-ext/mrblib/hash.rb
+++ b/mrbgems/mruby-hash-ext/mrblib/hash.rb
@@ -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
-- 
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