Converts hex value to RGB(a) values

hex-to-rgb.js

  /**
   * Converts hex value (without #) to rgb(a) object
   * @param  {String} hex 3, 6 or 8 digit hex (without #)
   * @return {Object} rgba values
   */
  function convertHexToRGB(hex) {
    var fullHex = hex;
    var rgba = {};

    if(hex.length === 3) {
      // Convert length === 3 to length === 6
      var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
      fullHex = hex.replace(shorthandRegex, function(m, r, g, b) {
        return r + r + g + g + b + b;
      });
    }

    if(hex.length === 8) {
      // Save alpha value to object and remove last two characters (alpha)
      rgba.a = convertRange(parseInt(hex.substring(hex.length - 2), 16), { min: 0, max: 255 }, { min: 0, max: 1 });
      fullHex = hex.substring(0, hex.length - 2);
    }

    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(fullHex);
    rgba.r = parseInt(result[1], 16);
    rgba.g = parseInt(result[2], 16);
    rgba.b = parseInt(result[3], 16);

    return rgba;
  }