Luis luiscvz
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| /** | |
| * Generates a check digit from a partial EAN13. | |
| * | |
| * https://www.gs1.org/services/how-calculate-check-digit-manually | |
| * | |
| * @param {string} barcode - 12 digit EAN13 barcode without the check digit | |
| */ | |
| function checkDigitEAN13(barcode) { | |
| const sum = barcode.split('') | |
| .map((n, i) => n * (i % 2 ? 3 : 1)) // alternate between multiplying with 3 and 1 |