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/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

void 0

13.7M/s

constant containing undefined

7.1M/s

undefined

5.0M/s

View exact numbers

Test name	Executions per second
✓ void 0	13,683,242 Ops/sec
constant containing undefined	7,059,856 Ops/sec
undefined	4,995,221 Ops/sec

Script Preparation code:

var a = 1, u = void 0;

Tests: