1 files changed, 19 insertions, 3 deletions
diff --git a/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb b/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
index dfc6ba87c..576605cb1 100644
--- a/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
+++ b/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
@@ -1,5 +1,21 @@
-module Integral
-  def div(other)
-    self.divmod(other)[0]
+class Numeric
+  def zero?
+    self == 0
+  end
+
+  def nonzero?
+    if self == 0
+      nil
+    else
+      self
+    end
+  end
+
+  def positive?
+    self > 0
+  end
+
+  def negative?
+    self < 0
   end
 end