Run results for: for..in vs object.keys grtynhdtfym

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

Object.keys.keys

29.5M/s

for...in

11K/s

View exact numbers

Test name	Executions per second
✓ Object.keys.keys	29,526,024 Ops/sec
for...in	11,039 Ops/sec

Script Preparation code:

let obj = {
        a: 1,
        b: [],
        c: 'abc',
        d: Symbol('test')
    },
    keys = Object.keys(obj).keys()

Tests: