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/132.0.0.0 Safari/537.36 Edg/132.0.0.0
Chrome 132
Windows
Desktop
one year ago
typeof
192.7M/s
operator
180.0M/s
in
177.5M/s
bool
177.3M/s
undefined
174.9M/s
View exact numbers
Test name Executions per second
✓ typeof 192,708,576 Ops/sec
operator 180,025,376 Ops/sec
in 177,521,840 Ops/sec
bool 177,296,096 Ops/sec
undefined 174,874,096 Ops/sec
Script Preparation code:
Tests: