let's code and play AoE. it's ok. Good luck

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witchcraft lol regex is a dark art

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No. This test case means that you also need to handle closures properly, i.e you shouldn't just create a new function and call it; you need to call the original function.

Even if you passed this test case, there are more tests that plays with closure. For example, this is the test after the above test case:

var closure_counter = (function accumulator() { var counter = 0; return function (x) { return counter += x; }; })();

What is the expected behavior of this test case? return NaN or throw exception?

It should be var timesFive = function (x) { var five = 5; return function (a) { return five * x; }(x); };. The test case is incorrect.