Check any barcode

JavaScript Advanced astronaut ages teen+ From CS Unplugged

The problem

Barcodes can have 8, 12 or 13 digits. Write a function isValidBarcode(code) that checks any of them. Start from the RIGHT: the last digit counts once, the next one three times, then once, then three times, and so on. The code is valid if the total divides by 10. Give back true or false.

You will practice: check digits, loops from the right, validation

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Test results

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CC BY-SA 4.0

Adapted from a CS Unplugged programming challenge by the University of Canterbury Computer Science Education Research Group, licensed CC BY-SA 4.0.

Original challenge · License: CC BY-SA 4.0

Changes: Rewritten in our own words as a function with tests, hints and steps, in Python and JavaScript, by Open Cosmos. This version is also CC BY-SA 4.0.