Run results for: Random string 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

generate

1.3M/s

crypto.randomUUID()

902K/s

View exact numbers

Test name	Executions per second
✓ generate	1,325,104 Ops/sec
crypto.randomUUID()	901,684 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()