hex to RGBA

hexToRGBA.js

const parseHex = (hex) => (startChar, endChar) =>
    	parseInt(hex.slice(startChar, endChar), 16);

function hexToRGBA(hex, a = 1) {
    const r = parseHex(hex)(1, 3);
    const g = parseHex(hex)(3, 5);
    const b = parseHex(hex)(5, 7);

    return `rgba(${r},${g},${b},${a})`;
}