fibonacci.js

class Fibonacci {
    fibonacci(num){
        if (!Number.isInteger(num)) {
            throw new Error('The Parameter must be an Integer!');
        }
        if (num < 0) {
            throw new Error('The Parameter must be positive!');
        } else if (num == 0) {
            return [0];
        } else if (num == 1)  {
            return [0, 1];
        } else if (num >= 2)  {
            let arr = [0, 1];
            for (let i = 2; i < num + 1; i++){
                arr.push(arr[i - 2] + arr[i - 1]);
            }
            return arr;
        }
    }
}

module.exports = Fibonacci;