i've missed space :) thank you

Else, return "x days"

That ^

You have to round the amount of days.

And that ^

test writes: Wrong number of days for December 31, 2511
Expected: 178711 days

i write console.log() and it writes 178711

i cant understand what's wrong?

See the first example. The sort is alphanumeric ascending.

From description:

If there is a tie, return a sorted list of all extensions.

expected [ '.html', '.cpp' ] to deeply equal [ '.cpp', '.html' ]
there are no rules about sorting so tests are maybe wrong?!