Sum(4)(5) = 9 //JavaScript

At least 21, listed at http://www.paulgraham.com/accgen.html solving a problem that contains this one.

    >>> def sum(x):
    ...   return lambda y: x + y
    ... 
    >>> sum(4)(5)
    9

    user=> (defn sum [x] #(+ % x)) 
    #'user/sum
    user=> ((sum 4) 5)
    9

  Func<int, int> Sum(int x)
  {
      return (Func<int, int>)((y) => x + y);
  }

  var z = Sum(4)(5);

    function math(input_func){
        return function(first_input){
            return function(second_input){
                return input_func(first_input, second_input)
            }
        }
    }

    function add(a, b){
        return a + b;
    }
    
    function subtract(a, b){
        return a - b;
    }
   

    alert math(add)(4)(5);
    alert math(subtract)(4)(5);

http://dankogai.typepad.com/blog/2006/03/lambda_calculus.htm...