Integer#step added

mrblib/numeric.rb

 ##
 # Integer
-#  
+#
 # ISO 15.2.8
 class Integer
 
@@ -44,6 +44,19 @@ class Integer
     end
     self
   end
+
+  ##
+  # Calls the given block from +self+ to +num+
+  # incremented by +step+ (default 1).
+  #
+  def step(num, step=1, &block)
+    i = if num.kind_of? Float then self.to_f else self end
+    while(i <= num)
+      block.call(i)
+      i += step
+    end
+    self
+  end
 end
 
 ##