Recursive Digit Sum

recursive_digit_sum

{
    function recuresiveDigitSumMaths(number) {
        finalRecuresiveDigitSum = 0;
        while (number) {
            digit = number % 10;
            finalRecuresiveDigitSum += digit;
            if (finalRecuresiveDigitSum > 9) finalRecuresiveDigitSum -= 9;
            number = (number - digit) / 10
        }
        return (finalRecuresiveDigitSum);
    }
    
    function recuresiveDigitSumMod9(number) {
        return (number % 9);
    }

    function recuresiveDigitSumMaths(number) {
        finalRecuresiveDigitSum = 0;
        while (number) {
            digit = number % 10;
            finalRecuresiveDigitSum += digit;
            if (finalRecuresiveDigitSum > 9) finalRecuresiveDigitSum -= 9;
            number = (number - digit) / 10
        }
        return (finalRecuresiveDigitSum);
    }

    function recuresiveDigitSumBrute(number) {
        digitSum = 0;
        while (number) {
            digit = number % 10;
            digitSum += digit;
            number = (number - digit) / 10
        }
        if (digitSum <= 9) {
            return digitSum;
        }
        else {
            return recuresiveDigitSumBrute(digitSum);
        }
    }


    function runTestforFixedValues(algorithms) {
        fixedValues = [0, 1, 10, 123, 999, 1000, 123456789];
        fixedValues.map(function (number) {
            console.log('--------------------------------');
            console.log("Input : " + number);
            algorithms.map(function (algorithm) {
                console.log("Using " + algorithm.name + " " + algorithm(number));;
            });
        });
    }

    function runTestforRandom(algorithms) {
        randomValues = [];
        max = 100000000;
        number = getRandomNumber(1, max);
        console.log('--------------------------------');
        console.log("Input : " + number);
        algorithms.map(function (algorithm) {
            console.log("Using " + algorithm.name + " " + algorithm(number));;
        });
    }

    function runTests() {
        algorithms = [recuresiveDigitSumBrute, recuresiveDigitSumMaths, recuresiveDigitSumMod9];
        console.log("===========================================");
        console.log("Running Tests for Fixed Values\n");
        runTestforFixedValues(algorithms);
        console.log("===========================================");
        console.log("\nRunning Tests for Random Values\n");
        loop(runTestforRandom, 10, [algorithms]);
    }



    function getRandomNumber(start = 1, end = 10) {
        if (start > end) {
            [start, end] = [end, start];
        }
        let range = end - start + 1;
        return (parseInt(Math.random() * range) % range) + start;
    }

    const loop = (fn, times = 5, params = []) => {
        if (!times) {
            return;
        }
        fn(...params);
        loop(fn, times - 1, params);
    };

    runTests();
}