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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

undefined

93.1M/s

constant containing undefined

85.9M/s

void 0

84.6M/s

View exact numbers

Test name	Executions per second
✓ undefined	93,056,008 Ops/sec
constant containing undefined	85,895,328 Ops/sec
void 0	84,573,432 Ops/sec

Script Preparation code:

var a = 1, u = void 0;

Tests: