I was stumped with this one for a bit until I realized that there was something extra at the end of my result string that didn't belong...

Of course I also did it the "longhand" way, too.

I got the same error.

When i typed this in solution area and submit: console.log(result); i got this in output area:"ehT kciuq nworb xof spmuj revo eht yzal .god "
Well the original string should be: "The quick brown fox jumps over the lazy dog.", that mean i do the correct answer,
but still error,confusing... so i have to skipped.