1 files changed, 42 insertions, 0 deletions
diff --git a/mrblib/numeric.rb b/mrblib/numeric.rb
new file mode 100644
index 000000000..ee5bdcb56
--- /dev/null
+++ b/mrblib/numeric.rb
@@ -0,0 +1,42 @@
+#
+#  Integer
+#
+class Integer
+  # 15.2.8.3.15
+  def downto(num, &block)
+    raise TypeError, "expected Integer" unless num.kind_of? Integer
+    i = self
+    while(i >= num)
+      block.call(i)
+      i -= 1
+    end
+    self
+  end
+
+  # 15.2.8.3.22
+  def times(&block)
+    i = 0
+    while(i < self)
+      block.call(i)
+      i += 1
+    end
+    self
+  end
+
+  # 15.2.8.3.27
+  def upto(num, &block)
+    raise TypeError, "expected Integer" unless num.kind_of? Integer
+    i = self
+    while(i <= num)
+      block.call(i)
+      i += 1
+    end
+    self
+  end
+end
+
+# include modules
+module Comparable; end
+class Numeric
+  include Comparable
+end