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Run results for: Typeof x === 'undefined' vs x === undefined (test without syntax error)

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36
Chrome 89
Windows
Desktop
4 years ago
Test name Executions per second
Typeof check 13830228.0 Ops/sec
Strict equality 4480603.5 Ops/sec
Script Preparation code:
AخA
 
var x = undefined;
Tests:

  • Typeof check

     
    typeof x === 'undefined';

  • Strict equality

     
    x === undefined;