Currying / Function composition in coffeescript

currycompose.coffee

arr = Array::
arrSlice = arr.slice 

curry = ->
   args = arrSlice.call arguments
   ->
      args2 = arrSlice.call arguments
      args[0].apply @, args.slice(1).concat(args2)

sum = ->
   args = arrSlice.call arguments
   res = 0
   res += n for n in args
   res

alert sum 1,2,3

sumWith2 = curry sum, 2

alert sumWith2 1

compose = (f,g) ->
   ->
      args = arrSlice.call arguments
      f g.apply @, args

double = (n) -> n * 2
triple = (n) -> n * 3
doubleTriple = compose double, triple

alert doubleTriple 5