Reduce-example

reduce.coffee

reduce = (input, iterator, memo) ->
  if input.length == 0
    memo
  else
    reduce(input.slice(1), iterator, iterator(memo, input[0]))

sum = (input) ->
  reduce(input, (memo, item) ->
    memo += item
    memo
  , 0)

result = sum([1,2,3])
console.dir result