Thank you, guys, I will check thngs out ...expecially - arguments[1]
...indeed! the case was with it...I have subsided it with plain figure - 23 and
get it passed...
Thank you all!

return resNum.pop();
...maybe put here the code - so someone could check?
...with spoiler tag?...

...no - the return ...;
is present -

JavaScript...
Hi guys!
Icannot pass test for the KATA - see below...
I have tested on in GOOGLE Dev.tools
and the result is that of expected, - but
I cannot pass it here...
I end up with single number - say 23 for (10,23) and 14 for (8,23)
but test states - 'undefined'
what can it be?

thenks in advance

Description:
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Finish the solution so that it returns the sum of all the multiples of 3 or 5 below the number passed in.
Note: If the number is a multiple of both 3 and 5, only count it once.