validate if number is valid Norwegian organisation number

org_number_validator.js

function isOrgNumberValid(orgNumber) {
	if (orgNumber.toString().length != 9) {
		return false;
	}
	const wheightNumbers = [3, 2, 7, 6, 5, 4, 3, 2];
	const orgNumbers = orgNumber.toString().split('');
	const controlDigit = orgNumbers[orgNumbers.length - 1]
	const result = wheightNumbers.map((n, i) => n * orgNumbers[i]).reduce((a, b) => a+b, 0)
	const rest = result % 11;
	return +controlDigit === rest;
}

Debug version:

function isOrgNumberValid(orgNumber) {
	if (orgNumber.toString().length != 9) {
		return "wrong length";
	}
	const wheightNumbers = [3, 2, 7, 6, 5, 4, 3, 2];
	const orgNumbers = orgNumber.toString().split('');
	const controlDigit = orgNumbers[orgNumbers.length - 1]
	const result = wheightNumbers.map((n, i) => n * orgNumbers[i]).reduce((a, b) => a+b, 0)
	const rest = result % 11;
	return +controlDigit + " === " + rest;
}