Run details:
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
IE 9
Windows 7
Desktop
2 years ago
Test name Executions per second
in operator 3697787.5 Ops/sec
!==undefined comparison 4292126.0 Ops/sec
Script Preparation code:
Tests:
  • in operator

  • !==undefined comparison


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