Run details:
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
IE 9
Windows 7
Desktop
3 years ago
Test name Executions per second
!variable 6958559.0 Ops/sec
variable===undefined 4672340.5 Ops/sec
Script Preparation code:
Tests:
  • !variable

  • variable===undefined