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/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15
Safari 18
Mac OS X 10.15.7
Desktop
one year ago
operator
223.1M/s
bool
223.0M/s
undefined
216.8M/s
typeof
204.2M/s
in
203.6M/s
View exact numbers
Test name Executions per second
✓ operator 223,116,496 Ops/sec
bool 222,977,104 Ops/sec
undefined 216,754,368 Ops/sec
typeof 204,175,264 Ops/sec
in 203,588,512 Ops/sec
Script Preparation code:
Tests: