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danlynn/calc-upc-check-digit.js

Created September 28, 2018 16:47
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calc-upc-check-digit.js
function CalcCheckDigit(uncheckedUpc) {
let checkDigit = 0;
for (let i = 0; i < 11; i++) {
checkDigit += parseInt(uncheckedUpc.charAt(i)) * (i % 2 === 0 ? 7 : 9);
}
return checkDigit % 10;
}
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