Run results for: void 0 vs undefined vs variable containing undefined

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.5

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
undefined	8393813.0 Ops/sec
void 0	20734222.0 Ops/sec
constant containing undefined	12156584.0 Ops/sec

Script Preparation code:

var a = 1, u = void 0;

Tests: