Nodejs Number to Roman Number Convert convertToRoman(number)

Method Source Code

String.prototype.reverse=function(){return this.split("").reverse().join("");}
function  {//from  w w  w  .  ja  v  a  2 s. c  o  m
   var romanNumValueArr = [
   {num: "I", value: 1},
   {num: "V", value: 5},
   {num: "X", value: 10},
   {num: "L", value: 50},
   {num: "C", value: 100},
   {num: "D", value: 500},
   {num: "M", value: 1000},
    ];
    var numString = number.toString();
    numString = numString.reverse();
    var romanString = "";
    var currentDigit;
    var lookUpArr;
    var lookUpDigit;
    var addTo = 0;
    var lookUpTable = {
       "0": [],
       "1": [0],
       "2": [0, 0],
       "3": [0, 0, 0],
       "4": [0, 1],
       "5": [1],
       "6": [1, 0],
       "7": [1, 0, 0],
       "8": [1, 0, 0, 0],
       "9": [0, 2]
    };
    for(var i = 0; i < numString.length; i++){
       currentDigit = numString[i];
       lookUpArr = lookUpTable[currentDigit];
       var temp = "";
       if(i > 0){
          addTo += 2;
       }
       for(var j = 0; j < lookUpArr.length; j++){
          lookUpDigit = lookUpArr[j] + addTo;
          //console.log(lookUpDigit + ' ' + romanNumValueArr[lookUpDigit].num);
          temp += romanNumValueArr[lookUpDigit].num;
       }
       romanString = temp + romanString;
    }

   return romanString;
}
console.log(convertToRoman(501));

Related

1. to_roman()

   mapa = {0:"", 1:"I", 5:"V", 10:"X"}
   lista = [0, 1, 5, 10]
   Number.prototype.to_roman = function() {
       if(this in mapa) return mapa[this]
       var num = menor_que(this, mapa)
       if((this+num) in mapa) return num.to_roman() + (this+num).to_roman()
       return num.to_roman() + (this-num).to_roman()
   function menor_que(num, mapa) {
   ...