Wat? You need arity guard!

arityguard.js

function arityGuard(f) {
  function guarded() {
    var length = f._length || f.length;
    if(arguments.length != length) {
      throw new TypeError(
        (f._name || f.name || '<anonymous>') +
        ' called with ' +
        arguments.length +
        ' argument(s), expected ' +
        length
      );
    }

    return f.apply(this, arguments);
  }
  
  // name and length assignments are ignored in most browsers.
  // Use special _name and _length properties as fallbacks.
  guarded._name = guarded.name = f._name || f.name;
  guarded._length = guarded.length = f._length || f.length;
  
  return guarded;
}

// > function add(a, b, c) { return a + b + c; }
//
// > arityGuard(add)(1, 2)
// TypeError: add called with 2 argument(s), expected 3
//
// > arityGuard(add)(1, 2, 3)
// 6
//
// > arityGuard(add)(1, 2, 3, 4)
// TypeError: add called with 4 argument(s), expected 3

// > > [1, 2, 3].map(arityGuard(parseInt))
// TypeError: parseInt called with 3 argument(s), expected 2