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@genediazjr
Created May 9, 2019 03:45
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const isValidServiceId = (serviceId) => {
serviceId = `${serviceId}`;
while (serviceId.length < 10) {
serviceId = `0${serviceId}`;
}
const rootId = serviceId.slice(0, -1);
let sum = 0;
for (let i = 0, index = rootId.length + 1; i < rootId.length; i++, index--) {
sum += parseInt(rootId[i]) * index;
}
const value = (11 - sum % 11) % 11;
return serviceId[9] === (value === 10 ? 'X' : value);
};
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