Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20120101 Firefox/33.0

Browser: Firefox 33

Operating system: Windows 7

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
a	2479.1 Ops/sec
b	11823.6 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; }