Ruby .times & .upto & .downto methods in Coffeescript

times.coffee

# Ruby = 5.times { |i| puts i }
# Coffee   = (1).times (i) -> console.log i
Number.prototype.times = (cb) ->
  i = -1;
  while (++i < this) then cb(i)
  +this

# Ruby = 1.upto(5) { |i| puts i }
# Coffee   = (1).upto 5, (i) -> console.log i
Number.prototype.upto = (t, cb) ->
  i = this
  if (t < this) then return +this
  while (i <= t) then cb(i++)
  +this

# Ruby = 15.downto(10) { |i| puts i }
# Coffee   = (15).downto 10, (i) -> console.log i
Number.prototype.downto = (t, cb) ->
  i = this
  if (t > this) then return +this
  while (i >= t) then cb(i--)
  +this