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Re:PracticeJS – Coding exercises in a mobile friendly web app by fwip on Sunday June 09, 2019 @01:38AM (#20137342)
Index 4 is the fifth element, 3. Index 0 is the first element (a zero).

Reread the examples.

Re:PracticeJS – Coding exercises in a mobile friendly web app by stevewodil on Sunday June 09, 2019 @09:56AM (#20139200)
Hmm...I see. Thank you for the help!