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lydell/pnr_check_digit.js

Created September 17, 2021 19:00
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Calculate the last digit of a Swedish personnummer – Note: don’t include `19` or `20` at the start!
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pnr_check_digit.js
check = s => { let v = s.split("").map((c, i) => { let d = Number(c); let m = i % 2 === 0 ? d * 2 : d; return m > 9 ? m - 9 : m }).reduce((a, b) => a + b, 0); return (10 - (v % 10)) % 10}
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