Run results for: creating new object vs changing fields

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

mutate object

272K/s

new object

270K/s

View exact numbers

Test name	Executions per second
✓ mutate object	271,828 Ops/sec
new object	269,841 Ops/sec

Script Preparation code:

function throwErr() {
  throw new Error("message");
}

Tests:

new object
(function() { let result = {status: 200, message: "ok"}; try { throwErr(); } catch (error) { result = {status: 400, message: error.message}; } return result; })()
mutate object
(function() { const result = {status: 200, message: "ok"}; try { throwErr(); } catch (error) { result.status = 400; result.message = error.message; } return result; })()