Run results for: if(!variable) vs if(variable===undefined) performance

Run details:

User agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)

Browser: IE 9

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
!variable	6958559.0 Ops/sec
variable===undefined	4672340.5 Ops/sec

Script Preparation code:

var variable;

Tests: