CPF Validation for Brazil

cpfValidator.js

function cpfValidate(str) {
	let match = str.match(/^(\d{9})-(\d{2})$/);
	if (!match) { return false }

	// If in the correct format
	let firstSetString = match[1];
	let secondSetString = match[2];
	let sum = 0;

	for (let i = 0; i < firstSetString.length; i++) {
		let char = firstSetString[i];
		let toMultiply = 10 - i;
		sum += Number(char) * toMultiply;
	}

	let simpleStepRes = (sum * 10) % 11;
	if (simpleStepRes === 10) { simpleStepRes = 0 }

	if (simpleStepRes.toString() !== secondSetString[0]) { return false; }
	
	sum = 0;
	let firstSetString2 = firstSetString + simpleStepRes.toString();

	for (let i = 0; i < firstSetString2.length; i++) {
		let char = firstSetString2[i];
		let toMultiply = 11 - i;

		sum += Number(char) * toMultiply;
	}

	let simpleStepRes2 = (sum * 10) % 11;
	if (simpleStepRes2 === 10) { simpleStepRes2 = 0 }

	if (simpleStepRes2.toString() !== secondSetString[1]) { return false; }
	return true;
}

console.log(cpfValidate("d840608472-32aw"))