Bonfire: Roman Numeral Converter - freecodecamp

gistfile1.txt

function convert(num) {
  
  var arRomans = [
    ["I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"], //1
    ["X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"], //10
    ["C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"]  //100
  ];
  
  var arConverted = [];
  var strConverted = "";
  
  //reverse given string and make an array from it
  //365 => Array(5,6,3)
  //to get decimals in right order => 1,10,100
  var arNum = num.toString().split("").reverse();

  //loop through digits
  //5,6,3 = 3 digits
  for(i=0;i<arNum.length;i++){
    //push romans to array
    //i=0 decimal 1
    //i=1 decimal 10
    //i=2 decimal 100
    //e.g.
    //5 = arRomans[0][5-1] = arRomans[0][4] = "V"
    //6 = arRomans[1][6-1] = arRomans[1][5] = "LX"
    //3 = arRomans[2][3-1] = arRomans[2][2] = "CCC"
    arConverted.push(arRomans[i][arNum[i]-1]);
  }
  
  //reverse the array again to get it in right order
  //and convert it to a string to be returned
  strConverted = arConverted.reverse().join("");
  //console.log(strConverted);
  
  return strConverted;
}

convert(999);