Run results for: undefined vs. typeof vs. in vs. operator

Object lookup performance

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36
Chrome 99
Windows
Desktop
one year ago
typeof
691.8M/s
bool
670.2M/s
operator
601.8M/s
in
571.4M/s
undefined
315.4M/s
View exact numbers
Test name Executions per second
✓ typeof 691,783,168 Ops/sec
bool 670,227,200 Ops/sec
operator 601,808,320 Ops/sec
in 571,413,248 Ops/sec
undefined 315,422,144 Ops/sec
Script Preparation code:
Tests: