Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; Pixel 3 XL) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.93 Mobile Safari/537.36

Browser: Chrome Mobile 88

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
a	625.8 Ops/sec
b	2973.4 Ops/sec

Tests:

a
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { Object.defineProperty(target, key+i, { get: function() {return _val;}, set: function(v) { target._v = v}, }); }
b
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { target[key+1] = undefined; }