Hmm. You are right. I did not check the output of the functions.

My mistake...

[4,5] means function(4)==5
[5,5] means function(5)==5
[4,5] means function(4)==5
f(4) and f(5) have diferent inputs, but they can return the same result.

Test.assertEquals(isFunction([[4,5], [5,5], [4,5]]),true)
This one?
Why it should be false?

The 3rd test case should be "false", but it returns true.

Can you check that test case, please?

Hi Fahd, do you mean the number of digit calculation?

could you explain this one? most unique one i've seen here.

Hi Yaprak,
I've checked my test cases and the array that you provided.
Everything is fine, the expected result for array is 6.
Can you please try to submit again, all tests ara randomly generated, so you should see a different result. Moreover there are predefined test cases that you can try by your own.

Ok. Thank you :)

Waiting for your fix...

Hi, definitely it should be 6 for the provided array. I will check and fix it during a day. Thank you for spotting it.