convertDecToHex.html

<script>
  
  /** Convert a decimal number to a hex number. */
  function convertDecToHex(dec) {
    
    var BASE = 16,
        result = '';
    
    return getHex( dec );
    
    function getHex(num){
    
      var whole = Math.floor( num / BASE ),
          remainder = num % BASE,
          tempHex = getHexLetter(remainder); 
      //console.log( whole + " r " + remainder + " // " + tempHex );
      
      // add the hex letter to the BEGINNING of the previous hex string
      result = tempHex + result;
      
      if ( whole > 0 ) {
        return getHex( whole ); //recurse until divisible whole is 0
      }else{
        return result;
      }
      
    }
    
    function getHexLetter(num){
      if ( num <= 9 ) return num;
      var letters = ["A", "B", "C", "D", "E", "F"];
      var i = num - 10;
      return letters[i];
    }
    
  }
    
</script>