Curry and uncurry in JavaScript

curry.html

<script>
function curry(f)
{
  if (typeof f != "function" || f.length < 2)
    return f;
    
  return mkHelper(f, []);
}

function mkHelper(f, args)
{
  return function(a)
  {
    var args1 = args.concat([a]);
    if (args1.length == f.length)
      return f.apply(this, args1);
    else
      return mkHelper(f, args1);
  };
}  

function uncurry(f)
{
  if (typeof f != "function" || f.length == 0)
    return f;

  return function()
  {
    var r = f;
    for (var i = 0; i < arguments.length; i++)
      r = r(arguments[i]);
    return r;
  };
}

function test(a, b, c)
{
  return a * b * c;
}

alert(uncurry(curry(test))(3, 4, 5));
alert(uncurry(curry([3,5])));
</script>