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
216.2M/s
operator
215.0M/s
bool
211.3M/s
undefined
206.1M/s
in
205.9M/s
View exact numbers
Test name Executions per second
✓ typeof 216,222,608 Ops/sec
operator 215,034,144 Ops/sec
bool 211,336,000 Ops/sec
undefined 206,059,856 Ops/sec
in 205,946,976 Ops/sec
Script Preparation code:
Tests: