Run results for: delete vs undefined1

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko

Browser: IE 11

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
undefined	1089.2 Ops/sec
delete	1229.6 Ops/sec

Tests:

undefined
var obj = {}; for(var i = 0; i < 1000;i++) { obj['a' + i] = i; } for(var i = 0; i < 1000;i++) { obj['a' + i] = undefined; }
delete
var obj = {}; for(var i = 0; i < 1000;i++) { obj['a' + i] = i; } for(var i = 0; i < 1000;i++) { delete obj['a' + i]; }