Answer 1

replace :- if (foodi == " indian food")
with:- if (foodi == "indian food")
There was a space between " and i.
Also i recommend using numbers like 1 for indian ,2 for international because indian food is not equal to Indian food(case-sensitive)

Answer 2

try using :-
var x="indian food";
if(foodi==x)

Answer 3

If you use space inside of " " then it does matter, same as "Somewords" is not the same as "Some words". But if you use it outside of " " then usually it doesn't matter.