Javascript: HEX to RGB to HSL

hex2hsl.js

function hexToHSL(hex) {
  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    r = parseInt(result[1], 16);
    g = parseInt(result[2], 16);
    b = parseInt(result[3], 16);
    r /= 255, g /= 255, b /= 255;
    var max = Math.max(r, g, b), min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2;
    if(max == min){
      h = s = 0; // achromatic
    }else{
      var d = max - min;
      s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
      switch(max){
        case r: h = (g - b) / d + (g < b ? 6 : 0); break;
        case g: h = (b - r) / d + 2; break;
        case b: h = (r - g) / d + 4; break;
      }
      h /= 6;
    }
  var HSL = new Object();
  HSL['h']=h;
  HSL['s']=s;
  HSL['l']=l;
  return HSL;
}