does not work

Question

code doesn't work why https://code.sololearn.com/WMfi36D15dEm/?ref=app

Answer 1

for(var i;i<9; i++) should be for(var i=0;i<9; i++)
The variable i must be a number type, as is it is undefined

Answer 2

Thank you so much ODLNT

Answer 3

LOID GAME,
Your welcome, I'm glad I could help.