Yeah, it'll work if you wrap both of your sorts into one sort function instead.

Node 14 should be enabled (Refer to this and this for more info)

Javascript sort wasn't stable in Node v8.3.

My code do nothing after attempt at second test:

Test Passed: Value deep equals [1, 8, 3, 3, 5, 6, 9, 7]
Expected: [0, 2, 2, 4, 8, 8, 3, 5, 5, 6, 9, 7, 56], instead got: [0, 2, 4, 2, 8, 8, 3, 6, 9, 5, 5, 7, 56]

It's strange

Code in next post

Thanks! I have forgotten, that 0 and null not the same :)

When an array in the array is null or empty, the method should return 0 too!

I have passed basic test, but then I had attempted a solution, I rescieved an error:

TypeError: arrayOfArrays is not iterable
at getLengthOfMissingArray (test.js:11:23)
at Context. (test.js:52:23)

All other test passed.

Maybe someone knows how solve that problem?

OK
Sorry

Mark your post as having spoiler content next time, please.

please attach your solution

Your function is printing 51, instead of returning 51.