function armstrongNumber(number) {
    if (number < 0 || number == null || number == undefined) {
        return false;
    }

    const ndigits = number.toString().length;
    let sum = 0;

    for (let i = 0; i < ndigits; i++) {
        sum = sum + number.toString()[i] ** ndigits;
    }

    return sum === number;
}
module.exports = {
    armstrongNumber,
};