roman-numeral-converter.txt

function convertToRoman(num) {
  
  const romanNums = {
      1: 'I',
      5: 'V',
      10: 'X',
      50: 'L',
      100: 'C',
      500: 'D',
      1000: 'M'
    }

  //break the number into decimals
  let divide = 10;
  let digit = 1;
  let breakNum = [];

  while(divide < num) {
    digit = num%divide;
    if(digit !== 0) {
      breakNum.push(digit);
    }   
    num = num - digit;
    divide *= 10;
  } 

  breakNum.push(num);
  breakNum.reverse();

  
  //convert each decimal into roman numerals
  const convert = num => {
    let res = '';

    let keySet = Object.keys(romanNums);

    for(let i=0; i<keySet.length; i++) {
      
      if(parseInt(keySet[i]) === num) {
          res = romanNums[keySet[i]];
          break;
        } 

      for(let j=0; j<keySet.length; j++) {
        
        if(parseInt(keySet[i]) - parseInt(keySet[j]) === num) {
          res = romanNums[keySet[j]] + romanNums[keySet[i]];
        }
        if(parseInt(keySet[i]) + parseInt(keySet[j]) === num) {                  
          res = romanNums[keySet[i]] + romanNums[keySet[j]];
          
        }   
          for(let z=0; z<keySet.length; z++) {          
            if(parseInt(keySet[i]) + parseInt(keySet[j]) + 
            parseInt(keySet[z]) === num) { 
                res = romanNums[keySet[i]] + romanNums[keySet[j]] + romanNums[keySet[z]];
            }

            for(let l=0; l<keySet.length; l++) {
           if(parseInt(keySet[i]) + parseInt(keySet[j]) + 
            parseInt(keySet[z]) + parseInt(keySet[l]) === num) {
              res = romanNums[keySet[i]] + romanNums[keySet[j]] + romanNums[keySet[z]] + romanNums[keySet[l]];
            }
         }           
          }                             
      }
      
    }
    return res; 
  }


  //provide converter function with each elements in array
  const convertedNums = (array, converterFunc) => {
    let romanNums = array.reduce((array, nextNum) => {
      array.push(converterFunc(nextNum));
      return array;
    },[]);
    return romanNums.join(""); 
  }


let finalRes = convertedNums(breakNum, convert);
console.log("final result is "+finalRes);
 return finalRes;
}


convertToRoman(1210);