 @returns {Boolean} true if this number is an odd integer, false otherwise.
 ###
 Number::odd = ->
-  if this > 0
-    this % 2 == 1
-  else
-    this % 2 == -1
+  not @even()
 
 ###*
 Calls iterator the specified number of times, passing in the number of the

@methodOf Number#
@returns {Number} The absolute value of the number.
###
Number::abs = () ->
  Math.abs(this)

###*
Returns the mathematical ceiling of this number.

@returns {Number} A number toward target by the ratio
###
Number::approachByRatio = (target, ratio) ->
  @approach(target, this * ratio)

###*
Returns a number that is closer to the target angle by the delta.
