Debug_2

d2.js

function curry(fx) {
  var arity = fx.length;

  function f1() {
    var args = Array.prototype.slice.call(arguments, 0);
    if (args.length >= arity) return fx.apply(null, args);

    function f2() {
      return f1.apply(null, args.concat(Array.prototype.slice.call(arguments, 0))); 
    }
    return f2;
  };
  return f1;
}