javascriptOff-by-oneMedium

Formatter appending extra characters

Time: 0:00

What it should do

joinWithDash(words) should join words with dashes between them, so joinWithDash(["a","b"]) returns "a-b".

What goes wrong

joinWithDash(["a","b"]) returns "a-b-" — there is a trailing dash.

Hints

This is an off-by-one errors bug

The loop that runs one time too many, the slice that drops the last item, the index that starts in the wrong place.