I did it this way and was so proud of myself for figuring out the list comprehension XD

OMG, thank you so much for this. I kept seeing this syntax in katas and had no idea what was going on. Appreciate it so much!

did the same hehe

The complexity in worth case (not any of b_values are in a_array) could be more efficient, but it's an elegant way of writing a solution

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It's beautiful... I'm always in a hurry and don't think much.

then the if function won't be necessary anyways. solution still works.

Smarty pants :)

So much cleaner code

wow

O(n).

Clever !