rgb2hex.js

const rgb2hex = (...args) => {
    const hexColour = (c) => {
        if (c < 256) return Math.abs(c).toString(16).padStart(2, "0");
        return 0;
    }

    let hex = "#";
    args.forEach(val => hex += hexColour(val))
    return hex
}

console.log(rgb2hex(10, 255, 255))