W1_L1_GCD.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        function getPrimeNumber(n) {
            var arr = [1,n];
            for (let i = n - 1; i >= 1; i--) {
                if (n % i === 0) {
                    arr.push(i);
                }
            }
            // let arr = [...new Set(emptyArr)];
            return arr;
        }

        let firstNumber = getPrimeNumber(10);
        let secondNumber = getPrimeNumber(5);
        let cd = firstNumber.filter(function (val) {
            return secondNumber.indexOf(val) != -1;
        });

        var gcd = cd[0];

        for (i = 0; i <= gcd; i++) {
            if (cd[i] > gcd) {
                var gcd = cd[i];
            }
        }
        console.log(gcd);
    </script>
</body>

</html>