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/143.0.0.0 Safari/537.36
Chrome 143
Mac OS X 10.15.7
Desktop
9 months ago
undefined
191.7M/s
operator
188.0M/s
in
187.3M/s
typeof
179.3M/s
bool
176.3M/s
View exact numbers
Test name Executions per second
✓ undefined 191,739,312 Ops/sec
operator 187,955,520 Ops/sec
in 187,346,352 Ops/sec
typeof 179,324,912 Ops/sec
bool 176,277,840 Ops/sec
Script Preparation code:
Tests: