examples/rosettacode/accumulator_factory.nit

   1 #!/usr/bin/env nit
   2 #
   3 # This file is part of NIT ( http://www.nitlanguage.org ).
   4 # This program is public domain
   5
   6 # The `accumulator factory` task.
   7 # SEE: <http://rosettacode.org/wiki/Accumulator_factory>
   8 #
   9 # Nit has no first-class function.
  10 # A class is used to store the state.
  11 module accumulator_factory
  12
  13 class Accumulator
  14         # The accumulated sum
  15         # Numeric is used, so Int and Float are accepted
  16         private var sum: Numeric
  17         fun call(n: Numeric): Numeric
  18         do
  19                 # `add` is the safe `+` method on Numeric
  20                 sum = sum.add(n)
  21                 return sum
  22         end
  23 end
  24
  25 var x = new Accumulator(1)
  26 x.call(5)
  27 var y = new Accumulator(3)
  28 print x.call(2.3)