Run results for: UUID methods

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; SM-G9650) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Mobile Safari/537.36

Browser: Chrome Mobile 87

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
uuidv4	0.4 Ops/sec
generateUUID	2.9 Ops/sec

Script Preparation code:

function generateUUID() { // Public Domain/MIT
    var d = new Date().getTime(); //Timestamp
    var d2 = (performance && performance.now && (performance.now() * 1000)) || 0; //Time in microseconds since page-load or 0 if unsupported
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = Math.random() * 16; //random number between 0 and 16
        if (d > 0) { //Use timestamp until depleted
            r = (d + r) % 16 | 0;
            d = Math.floor(d / 16);
        } else { //Use microseconds since page-load if supported
            r = (d2 + r) % 16 | 0;
            d2 = Math.floor(d2 / 16);
        }
        return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
    });
}


function uuidv4() {
    return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
        (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
    );
}

Tests:

uuidv4
for (var i=0; i<10000; i++){ uuidv4(); }
generateUUID
for (var i=0; i<10000; i++){ generateUUID(); }