Well, this is a common trick (but how you could not come up with a one line solution when you have the more powerful eval)
Nvm, once you see it, you cannot forget it o_O

Thanks mate :D

Very efficient as well ;)

I am indeed :)

Thanks for your post!

Yes. Error was due to my test for an empty array not working. Sorry for wasting your time, (I now need to find out why the test didn't work).

I don't know why myself and bhaviksheth were unable to view the results of the basic test or log the inputs.

But you succeeded!

I'm getting the same result as bhaviksheth. (60 passed and one error).

I'm also unable to expand the basics tests (where the error is) and I receive the following message at the bottom of the output screen.

Unhandled rejection TestError: Expected: 'null', instead got: '0'

My code handles the empty array case.

Thanks for creating the Kata.

Did you push the Red arrow? You should have something like that (it is an example of what I got):

Test Results:
  Basic tests
  Small numbers
✘ Expected: '[13, 12]', instead got: '[11, 12]'

........

or if you console.log the input:

Basic tests
  Small numbers
 Log
 [ [ 1, 3 ], [ 1, 3 ], [ 1, 4 ] ]
✘ Expected: '[13, 12]', instead got: '[11, 12]'

In your code you could console.log the input.

You can print your input (console.log) and so see what it was.