Run results for: defineproperty (data property) vs direct assignment

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Goanna/6.8 PaleMoon/34.0.1

Browser: Pale Moon (Firefox Variant) 34

Operating system: Linux

Device Platform: Desktop

Date tested: 28 days ago

Test name	Executions per second
a	1125.2 Ops/sec
b	27461.7 Ops/sec

Tests:

a
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { Object.defineProperty(target, key+i, { configurable: true, enumerable: true, writable: false, value: undefined, }); }
b
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { target[key+1] = undefined; }