How to detect the operating system using javascript

Sometimes it is necessary to determine the user's operating system.

Example:

Your OS is your os

function detectOS() {
    const platform = navigator.platform.toLowerCase(),
        iosPlatforms = ['iphone', 'ipad', 'ipod', 'ipod touch'];

    if (platform.includes('mac')) return 'MacOS';
    if (iosPlatforms.includes(platform)) return 'iOS';
    if (platform.includes('win')) return 'Windows';
    if (/android/.test(navigator.userAgent.toLowerCase())) return 'Android';
    if (/linux/.test(platform)) return 'Linux';

    return 'unknown';
}