Create a RomanNumerals class that can convert a roman numeral to and from an integer value. It should follow the API demonstrated in the examples below. Multiple roman numeral values will be tested for each helper method. Modern Roman numerals are written by expressing each digit separately starting with the left most digit and skipping any digi…

gistfile1.txt

var RomanNumerals = {
 toRoman : function (number) {
  var ret = '';
  while(number > 0) {
    if(number/1000 >= 1) {
      ret += 'M';
      number -=1000;
    } else if(number/900 >= 1) {
      ret += 'CM';
      number -=900;
    } else if(number/500 >= 1) {
      ret += 'D';
      number -=500;
    } else if(number/400 >= 1) {
      ret += 'CD';
      number -=400;
    } else if(number/100 >= 1) {
      ret += 'C';
      number -=100;
    } else if(number/90 >= 1) {
      ret += 'XC';
      number -=90;
    } else if(number/50 >= 1) {
      ret += 'L';
      number -=50;
    } else if(number/40 >= 1) {
      ret += 'XL';
      number -=40;
    } else if(number/10 >= 1) {
      ret += 'X';
      number -=10;
    } else if(number/9 >= 1) {
      ret += 'IX';
      number -=9;
    } else if(number/5 >= 1) {
      ret += 'V';
      number -=5;
    } else if(number/4 >= 1) {
      ret += 'IV';
      number -=4;
    } else if(number/1 >= 1) {
      ret += 'I';
      number -=1;
    } 
  }
  return ret;
}
,fromRoman : function(str) {
  var ret = 0;
  while(str.length > 0) {
    switch(str.charAt(0)) {
      case 'M': 
        str = str.slice(1);
        ret+=1000;
        break;
      case 'D':
        str = str.slice(1);
        ret+=500;
        break;
      case 'L':
        str = str.slice(1);
        ret+=50;
        break;
      case 'C':
        if(str.charAt(1) === 'M') {
          str = str.slice(2);
          ret+=900;
        } else if(str.charAt(1) === 'D') {
          str = str.slice(2);
          ret+=400;
        } else {
          str = str.slice(1);
          ret+=100;
        } break;
      case 'X':
        if(str.charAt(1) === 'C') {
          str = str.slice(2);
          ret+=90;
        } else if(str.charAt(1) === 'L') {
          str = str.slice(2);
          ret+=40;
        } else {
          str = str.slice(1);
          ret+=10;
        } break;
      case 'V':
        str = str.slice(1);
        ret+=5;
        break;
      case 'I':
        if(str.charAt(1) === 'X') {
          str = str.slice(2);
          ret+=9;
        } else if(str.charAt(1) === 'V') {
          str = str.slice(2);
          ret+=4;
        } else {
          str = str.slice(1);
          ret+=1;
        } break;
    }
  }
  return ret;
}
}

RomanNumerals.toRoman('M');

const dec = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1];
const rom = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I'];

class RomanNumerals {
static fromRoman(str) {
return str.match(/CM|CD|XC|XL|IX|IV|\w/g).reduce((pre, val) => pre + dec[rom.indexOf(val)], 0);
}

static toRoman(num) {
return dec.reduce((pre, val, idx) => pre + rom[idx].repeat(num / val ^ 0, num -= val * (num / val ^ 0)), ``);
}
}

console.log(RomanNumerals.toRoman(1000))