Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0) Gecko/20100101 Firefox/76.0

Browser: Firefox 76

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
a	1975.0 Ops/sec
b	37039.4 Ops/sec

Tests:

a
var target = {}; var key = 'something'; for (var i=0; i<1000; i++) { target[key+1] = undefined; } for (var i=0; i<1000; i++) { if (delete target[key+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; }