Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.24 (KHTML, like Gecko) Chrome/61.0.3163.128 Safari/534.24 XiaoMi/Mint Browser/3.7.2

Browser: Chrome 61

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
a	619.1 Ops/sec
b	5175.8 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; }