1 files changed, 58 insertions, 0 deletions
diff --git a/mrblib/hash.rb b/mrblib/hash.rb
new file mode 100644
index 000000000..7157684f8
--- /dev/null
+++ b/mrblib/hash.rb
@@ -0,0 +1,58 @@
+#
+#  Hash
+#
+class Hash
+  # 15.2.13.4.8
+  def delete(key, &block)
+    if block && ! self.has_key?(key)
+      block.call(key)
+    else
+      self.__delete(key)
+    end
+  end
+
+  # 15.2.13.4.9
+  def each(&block)
+    self.keys.each{|k| block.call([k, self[k]])}
+    self
+  end
+
+  # 15.2.13.4.10
+  def each_key(&block)
+    self.keys.each{|k| block.call(k)}
+    self
+  end
+
+  # 15.2.13.4.11
+  def each_value(&block)
+    self.keys.each{|k| block.call(self[k])}
+    self
+  end
+
+  # 15.2.13.4.16
+  def initialize(*args, &block)
+    self.__init_core(block, *args)
+  end
+
+  # 15.2.13.4.22
+  def merge(other, &block)
+    h = {}
+    raise "can't convert argument into Hash" unless other.respond_to?(:to_hash)
+    other = other.to_hash
+    self.each_key{|k| h[k] = self[k]}
+    if block
+      other.each_key{|k|
+        h[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]
+      }
+    else
+      other.each_key{|k| h[k] = other[k]}
+    end
+    h
+  end
+end
+
+# include modules
+module Enumerable; end
+class Hash
+  include Enumerable
+end