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Why do you use the ++ at 3:26, and not the +1
just confused, because tried to do index +1, but it just goes crazy. When I do the ++ everything is fine
The statement, index + 1, doesn't assign to anything. You probably mean
index = index + 1
This is assigning the value of the variable index to index + 1.
index++ is shorthand for index = index + 1