Run results for: Object.defineProperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

11K/s

9K/s

View exact numbers

Test name	Executions per second
✓ b	11,332 Ops/sec
a	9,395 Ops/sec

Tests:

a
let target = {}; let key = 'something'; for (let i = 0; i < 1000; i++) { Object.defineProperty(target, key + i, {value: i}); }
b
let target = {}; let key = 'something'; for (let i = 0; i < 1000; i++) { target[key + i] = i; }