/**
 * ECMA2015
 */
function convertHex(hexCode, opacity = 1){
    var hex = hexCode.replace('#', '');

    if (hex.length === 3) {
        hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
    }

    var r = parseInt(hex.substring(0,2), 16),
        g = parseInt(hex.substring(2,4), 16),
        b = parseInt(hex.substring(4,6), 16);

    /* Backward compatibility for whole number based opacity values. */
    if (opacity > 1 && opacity <= 100) {
        opacity = opacity / 100;   
    }
    
    return 'rgba('+r+','+g+','+b+','+opacity+')';
}