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

Object lookup performance

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Chrome 130
Mac OS X 10.15.7
Desktop
one year ago
typeof
28.6M/s
operator
26.4M/s
bool
26.0M/s
undefined
24.3M/s
in
23.4M/s
View exact numbers
Test name Executions per second
✓ typeof 28,609,036 Ops/sec
operator 26,432,382 Ops/sec
bool 26,038,208 Ops/sec
undefined 24,347,706 Ops/sec
in 23,382,440 Ops/sec
Script Preparation code:
Tests: