Validate CPF

validateCPF.js

export default function validateCPF(strCPF) {
    let sum = 0
    let rest
    if (strCPF == "00000000000") return false
    for (let i = 1; i <= 9; i++) sum = sum + parseInt(strCPF.substring(i-1, i)) * (11 - i)
    rest = (sum * 10) % 11
    if ((rest == 10) || (rest == 11))  rest = 0
    if (rest != parseInt(strCPF.substring(9, 10)) ) return false
    sum = 0
    for (let i = 1; i <= 10; i++) sum = sum + parseInt(strCPF.substring(i-1, i)) * (12 - i)
    rest = (sum * 10) % 11
    if ((rest == 10) || (rest == 11))  rest = 0
    if (rest != parseInt(strCPF.substring(10, 11) ) ) return false
    return true
}