Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (X11; Linux i686 (x86_64)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.214 Safari/537.36

Browser: Chrome 90

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
a	471.5 Ops/sec
b	23697.7 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; }