Run results for: defineproperty vs direct assignment

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0

Browser: Firefox 59

Operating system: Ubuntu

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
a	1288.8 Ops/sec
b	44473.6 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; }