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Vergi Kimlik Numarası (VKN) doğrulama.
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// Examples: | |
// Valid: "3973535717", "2037637860", "2823097943", "2012460224" | |
// Not Valid: "3973535711", "123", "9999999999", | |
function verifyVkn(vkn) { | |
if (typeof vkn !== 'string') throw new TypeError('vkn should be a string'); | |
if (vkn.length !== 10) throw new TypeError('invalid length'); | |
const digits = vkn.split(''); | |
const control = digits.pop(); // eslint-disable-line | |
const r = []; | |
digits.forEach((el, i) => { | |
const x = Number(el) + 10 - (i + 1); | |
const mod = x % 10; | |
if (mod === 9) { | |
r.push(mod); | |
} else { | |
const pow = 2 ** (10 - (i + 1)); | |
r.push((mod * pow) % 9); | |
} | |
}); | |
const total = r.reduce((acc, cur) => acc + cur); | |
const c = (10 - ((total % 10) % 10)) % 10; | |
return `${digits.join('')}${c}` === vkn; | |
} |
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