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

Object lookup performance

Go to the benchmark
Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Mobile/15E148 Safari/604.1
Mobile Safari 16
iOS 16.7.5
Mobile
2 years ago
in
5.9M/s
bool
5.8M/s
hasOwnProperty
5.8M/s
typeof
5.7M/s
undefined
1.9M/s
View exact numbers
Test name Executions per second
✓ in 5,924,637 Ops/sec
bool 5,837,322 Ops/sec
hasOwnProperty 5,820,322 Ops/sec
typeof 5,738,980 Ops/sec
undefined 1,949,878 Ops/sec
Script Preparation code:
Tests: