Javascript to detect OS, browser, ipad, iphone etc

browser_os_detect.js

// define 'is' object and current version
let is = {};
is.VERSION = '0.9.0';

// store navigator properties to use later
let navigator = window.navigator || {};
let platform = (navigator.platform || '').toLowerCase();
let userAgent = (navigator.userAgent || '').toLowerCase();
let vendor = (navigator.vendor || '').toLowerCase();

// is current browser opera?
// parameter is optional
is.opera = function(range) {
	let match = userAgent.match(/(?:^opera.+?version|opr)\/(\d+)/);
	return match !== null /* && compareVersion(match[1], range) */;
};

// is current browser chrome?
// parameter is optional
is.chrome = function(range) {
	let match = /google inc/.test(vendor) ? userAgent.match(/(?:chrome|crios)\/(\d+)/) : null;
	return match !== null && !is.opera() /* && compareVersion(match[1], range) */;
};

// is current device iphone?
// parameter is optional
is.iphone = function(range) {
	// avoid false positive for Facebook in-app browser on ipad;
	// original iphone doesn't have the OS portion of the UA
	let match = is.ipad() ? null : userAgent.match(/iphone(?:.+?os (\d+))?/);
	return match !== null /* && compareVersion(match[1] || 1, range) */;
};

// is current device ipad?
// parameter is optional
is.ipad = function(range) {
	let match = userAgent.match(/ipad.+?os (\d+)/);
	return match !== null /* && compareVersion(match[1], range) */;
};

// is current device ipod?
// parameter is optional
is.ipod = function(range) {
	let match = userAgent.match(/ipod.+?os (\d+)/);
	return match !== null /* && compareVersion(match[1], range) */;
};

// is current device ios?
is.ios = function() {
	return is.iphone() || is.ipad() || is.ipod();
};

// is current operating system mac?
is.mac = function() {
	return /mac/.test(platform);
};

function getChromeVersion () {
    var raw = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
    return raw ? parseInt(raw[2], 10) : false;
}