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validate-cpf.ts
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validate-cpf.ts
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/**
* verify if cpf is valid
* @param cpf string with 11 numbers without any other char else number
* @returns if is valid or not
*/
export function validateCPF(cpf: string) {
const nineFirstNumbers = cpf.slice(0, 9).split("");
const digitVerify = cpf.slice(9);
const nineFirstNumbersMultiplied = nineFirstNumbers.map(
(n, i) => Number(n) * (10 - i)
);
let sumNineFirstNumbers = 0;
for (let i = 0; i < 9; i++) {
sumNineFirstNumbers += Number(nineFirstNumbersMultiplied[i]);
}
const c1 = (sumNineFirstNumbers * 10) % 11;
let n1;
if (c1 === 10 || c1 === 11) {
n1 = "0";
} else {
n1 = String(c1);
}
if (n1 !== digitVerify[0]) {
return false;
}
// -
const tenFirstNumbers = cpf.slice(0, 10).split("");
const tenFirstNumbersMultiplied = tenFirstNumbers.map(
(n, i) => Number(n) * (11 - i)
);
let sumTenFirstNumber = 0;
for (let i = 0; i < 10; i++) {
sumTenFirstNumber += Number(tenFirstNumbersMultiplied[i]);
}
const c2 = (sumTenFirstNumber * 10) % 11;
let n2;
if (c2 === 10 || c2 === 11) {
n2 = "0";
} else {
n2 = String(c2);
}
if (n2 !== digitVerify[1]) {
return false;
}
if (cpf === "00000000000") {
return false;
}
return true;
}