curry method for javascript with support for context

curry.js

// curry(fn[, context[, arity[, params...]]])
var curry = function (fn, context, arity) {
  var args = Array.prototype.slice.call(arguments, 0);
  
  if (!context) {
    context = context || undefined;
    args[1] = context;
  }

  if (!arity) {
    arity = arity || fn.length;
    args[2] = arity;
  }

  if (arity === (args.length - 3)) {
    return fn.apply(context, args.slice(3));
  }

  return function () {
    var args2 = Array.prototype.slice.call(arguments, 0);
    return curry.apply(context, args.concat(args2));
  };
};