Run results for: Random string 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
generate	1836183.8 Ops/sec
crypto.randomUUID()	944521.0 Ops/sec

Script Preparation code:

var registeredIds = new Set();
function generate(length) {
    let id = Math.random().toString(36).substring(2, length + 2);
    while(this.registeredIds.has(id)) {
      id = Math.random().toString(36).substring(2, length + 2);
    }

    registeredIds.add(id);
    return id;
}

Tests:

generate
generate(10)
crypto.randomUUID()
crypto.randomUUID()

Run results for: Random string 2

generate

crypto.randomUUID()