MyFreeCodeCamp/RomanNumeralConverter.js at master · apasternack/MyFreeCodeCamp · GitHub

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function convertToRoman(num) {


    var romanNumeralArray = ['I', 'V', 'X', 'L', 'C', 'D', 'M', 'v', 'x'];
    var romanNumeralSet = [];
    var romanNumeral = "";
    var romanNumeralObject;
    var baseTenDigit;

    //write for loop with terminating condition being length


    if (num > 0) {
        baseTenDigit = num.toString().slice(-1);
        romanNumeralSet = romanNumeralArray.slice(0, 3);

        romanNumeral = printRomanNumeral(baseTenDigit, romanNumeralSet);
    }

    if (num >= 10) {
        baseTenDigit = num.toString().slice(-2, -1);
        romanNumeralSet = romanNumeralArray.slice(2, 5);

        romanNumeral = printRomanNumeral(baseTenDigit, romanNumeralSet) + romanNumeral;

    }

    if (num >= 100) {
        baseTenDigit = num.toString().slice(-3, -2);
        romanNumeralSet = romanNumeralArray.slice(4, 7);

        romanNumeral = printRomanNumeral(baseTenDigit, romanNumeralSet) + romanNumeral;

    }

    if (num >= 1000) {

        baseTenDigit = num.toString().slice(-4, -3);
        romanNumeralSet = romanNumeralArray.slice(6, 9);

        romanNumeral = printRomanNumeral(baseTenDigit, romanNumeralSet) + romanNumeral;

    }

    return romanNumeral;

}


console.log(convertToRoman(1000));


//given a roman numeral set and roman numaral object print a roman numeral that represents a base 10 digit; return a RN representation of base10 digit, eg "IX"
function printRomanNumeral(digit, romanNumeralSet) {

    var ones = romanNumeralSet[0];
    var fives = romanNumeralSet[1];
    var tens = romanNumeralSet[2];
    var romanNumeral = '';
    digit = parseInt(digit);


    //if 1-3 print 1-3 "1"s
    if (digit < 4) {
        for (var i = digit; i > 0; i--) {
            romanNumeral += ones;
        }
    }
    //if 4 print 1 "1"  && print one "5"
    if (digit === 4) {
        romanNumeral = ones + fives;

    }
    // if 5 print NO "1" && print "5"
    if (digit === 5) {
        romanNumeral = fives;
    }
    // if 6-8 print 6-8 - 5 "1"s
    if (digit > 5 && digit < 9) {
        romanNumeral = fives;
        for (var i = digit - 5; i > 0; i--) {
            romanNumeral += ones;
        }
    }
    // if 9 print 1 "1" and a "10"
    if (digit === 9) {
        romanNumeral = ones + tens;
    }

    return romanNumeral; //STRING VALUE TO BUILD UP ROMAN NUMERAL
}

// function convertDigit(digit) {

//     digit = parseInt(digit);
//     var romanNumeralObject = {
//         ones: 0,
//         fives: 0,
//         tens: 0
//     }

//     if (digit < 4) {
//         romanNumeralObject.ones = digit;
//     }
//     if (digit === 4) {
//         romanNumeralObject.ones = 1;
//         romanNumeralObject.fives = 1;
//     }
//     if (digit === 5) {
//         romanNumeralObject.fives = 1;
//     }
//     if (digit > 5 && digit < 9) {
//         romanNumeralObject.fives = 1;
//         romanNumeralObject.ones = digit - 5;
//     }
//     if (digit === 9) {
//         romanNumeralObject.ones = 1;
//         romanNumeralObject.tens = 1;
//     }

//     return romanNumeralObject;
// }