RGB-to-Hexadecimal and Hexadecimal-RGB conversion

rgb-to-hex.js

const hexToRgb = (hex) => {
    const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
    return result ? {
      r: parseInt(result[1], 16),
      g: parseInt(result[2], 16),
      b: parseInt(result[3], 16)
    } : null;
}

module.exports.hexToRgb = hexToRgb;

const rgbToHex = (r, b, g) => {
    const toHex = (c) => {
        let hex = c.toString(16);
        return hex.length == 1 ? "0" + hex : hex;
    }
    return toHex(r) + toHex(g) + toHex(b);
}

module.exports.rgbToHex = rgbToHex