romanNumeral.js

function convertToRoman(num) {
  var first = "";
  var second = "";
  var third = "";
  var count = "";
  var placeHolder = "";
  var addFirst = "";
  var addSecond = "";
  var answer = "";
  var test = "";
  var waitingArray = [];
  var roman = {
    1: "I",
    4: "IV",
    5: "V",
    9: "IX",
    10: "X",
    40: "XL",
    50: "L",
    90: "XC",
    100: "C",
    400: "CD",
    500: "D",
    900: "CM",
    1000: "M"
  };

  if (num > 0 && num < 10) {
    test = (num.toString().split(""));
    first = test[0];
  }
  if (first >= 1 && first < 4) {
    //between 1 and 3
    count = first;
    placeHolder = roman[1].repeat(count);
    waitingArray.push(placeHolder);
  } else if (first >= 4 && first < 5) {
    // between 4 and 5
    placeHolder = roman[4];
    waitingArray.push(placeHolder);
  } else if (first >= 5 && first < 6) {
    // number is at 5
    placeHolder = roman[5];
    waitingArray.push(placeHolder);
  } else if (first >= 6 && first < 9) {
    // between 6 and 8
    count = first - 5;
    addFirst = roman[5];
    addSecond = roman[1].repeat(count);
    placeHolder = addFirst + addSecond;
    waitingArray.push(placeHolder);
  } else if (first >= 9 && first < 10) {
    // number is at 9
    placeHolder = roman[9];
    waitingArray.push(placeHolder);
  }




  if (num >= 10 && num < 100) {
    test = (num.toString().split(""));
    first = test[0] + "0";
    second = test[1];
  }

  // FIRST DIGIT
  if (first >= 10 && first < 40) {
    count = first / 10;
    placeHolder = roman[10].repeat(count);
    waitingArray.push(placeHolder);
  } else if (first >= 40 && first < 50) {
    placeHolder = roman[40];
    waitingArray.push(placeHolder);
  } else if (first >= 50 && first < 60) {
    placeHolder = roman[50];
    waitingArray.push(placeHolder);
  } else if (first >= 60 && first < 90) {
    count = (first - 50) / 10;
    addFirst = roman[50];
    addSecond = roman[10].repeat(count);
    placeHolder = addFirst + addSecond;
    waitingArray.push(placeHolder);
  } else if (first >= 90 && first < 100) {
    placeHolder = roman[90];
    waitingArray.push(placeHolder);
  }


  // SECOND DIGIT
  if (second >= 1 && second < 4) {
    //between 1 and 3
    count = second;
    placeHolder = roman[1].repeat(count);
    waitingArray.push(placeHolder);
  } else if (second >= 4 && second < 5) {
    // between 4 and 5
    placeHolder = roman[4];
    waitingArray.push(placeHolder);
  } else if (second >= 5 && second < 6) {
    // number is at 5
    placeHolder = roman[5];
    waitingArray.push(placeHolder);
  } else if (second >= 6 && second < 9) {
    // between 6 and 8
    count = second - 5;
    addFirst = roman[5];
    addSecond = roman[1].repeat(count);
    placeHolder = addFirst + addSecond;
    waitingArray.push(placeHolder);
  } else if (second >= 9 && second < 10) {
    // number is at 9
    placeHolder = roman[9];
    waitingArray.push(placeHolder);
  }

  if (num > 99 && num < 1000) {
    test = (num.toString().split(""));
    first = test[0] + "0" + "0";
    second = test[1] + "0";
    third = test[2];
  }

  // FIRST DIGIT
  if (first >= 100 && first < 400) {
    // between 100 and 399
    count = first / 100;
    placeHolder = roman[100].repeat(count);
    waitingArray.push(placeHolder);
  } else if (first >= 400 && first < 500) {
    // between 400 and 499
    placeHolder = roman[400];
    waitingArray.push(placeHolder);
  } else if (first >= 500 && first <= 599) {
    // between 500 and 599
    placeHolder = roman[500];
    waitingArray.push(placeHolder);
  } else if (first < 900 && first > 500) {
    // between 600 and 899
    count = (first - 500) / 100;
    addFirst = [roman[500]];
    addSecond = [roman[100].repeat(count)];
    placeHolder = addFirst + addSecond;
    waitingArray.push(placeHolder);
  } else if (first >= 900 && first <= 1000) {
    // between 900 to 999
    placeHolder = roman[900];
    waitingArray.push(placeHolder);
  }

  // SECOND DIGIT
  if (second >= 10 && second < 40) {
    // between 10 & 39
    count = second / 10;
    placeHolder = roman[10].repeat(count);
    waitingArray.push(placeHolder);
  } else if (second >= 40 && second < 50) {
    // between 40 and 49
    placeHolder = roman[40];
    waitingArray.push(placeHolder);
  } else if (second >= 50 && second < 60) {
    // between 50 and 59
    placeHolder = roman[50];
    waitingArray.push(placeHolder);
  } else if (second >= 60 && second < 90) {
    //between 60 and 89
    count = (second - 50) / 10;
    addFirst = roman[50];
    addSecond = roman[10].repeat(count);
    placeHolder = addFirst + addSecond;
    waitingArray.push(placeHolder);
  } else if (second >= 90 && second < 100) {
    placeHolder = roman[90];
    waitingArray.push(placeHolder);
  }

  //THIRD DIGIT
  if (third >= 1 && third < 4) {
    //between 1 and 3
    count = third;
    placeHolder = roman[1].repeat(count);
    waitingArray.push(placeHolder);
  } else if (third >= 4 && third < 5) {
    // between 4 and 5
    placeHolder = roman[4];
    waitingArray.push(placeHolder);
  } else if (third >= 5 && third < 6) {
    // number is at 5
    placeHolder = roman[5];
    waitingArray.push(placeHolder);
  } else if (third >= 6 && third < 9) {
    // between 6 and 8
    count = third - 5;
    addFirst = roman[5];
    addSecond = roman[1].repeat(count);
    placeHolder = addFirst + addSecond;
    waitingArray.push(placeHolder);
  } else if (third >= 9 && third < 10) {
    // number is at 9
    placeHolder = roman[9];
    waitingArray.push(placeHolder);
  }
  num = waitingArray.join("");
  console.log(num);
}

convertToRoman(852);