cascade.js

/* Mimics the way Haskell function works */
function cascade(fn, n) {
  return (function helper(args) {
    return function () {
      args = args.concat(Array.prototype.slice.call(arguments))
      return (args.length >= n) ? fn.apply(null, args) : helper(args)
    }
  }([]))
}

Example

var add = cascade(function (a, b) {return a + b}, 2)
console.assert(add(1)(2) === 3)