Array.sort converts to UTF-16 code units, or some such weirdness, by default. If you are sorting anything other than strings, you will want to pass in a compari

Array.sort converts to UTF-16 code units, or some such weirdness, by default. If you are sorting anything other than strings, you will want to pass in a comparison function. [1,3,2,4,5,7,8,9,10].sort((a,b) => a - b) gives you the behavior one would expect. I suppose you already know that, though. Agreed there are lots of quirks.