Convert Hex Color to rgba with opacity

Hex Color to rgba.js

/**
 * ECMA2015
 */
function convertHex(hexCode,opacity){
    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);

    return 'rgba('+r+','+g+','+b+','+opacity/100+')';
}

/**
 * ECMA2016 / ES6
 */
const convertHexToRGBA = (hexCode, opacity) => {
    let hex = hexCode.replace('#', '');
    
    if (hex.length === 3) {
        hex = `${hex[0]}${hex[0]}${hex[1]}${hex[1]}${hex[2]}${hex[2]}`;
    }    
    
    const r = parseInt(hex.substring(0, 2), 16);
    const g = parseInt(hex.substring(2, 4), 16);
    const b = parseInt(hex.substring(4, 6), 16);

    return `rgba(${r},${g},${b},${opacity / 100})`;
};