Run results for: for...of Object.keys vs for...of Object.keys.values

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

...of Object.keys.keys

28.5M/s

...of Object.keys

10K/s

View exact numbers

Test name	Executions per second
✓ ...of Object.keys.keys	28,467,942 Ops/sec
...of Object.keys	10,190 Ops/sec

Script Preparation code:

let obj = {
        a: 1,
        b: [],
        c: 'abc',
        d: Symbol('test')
    },
    keys1 = Object.keys(obj),
    keys2 = keys1.values()

Tests:

...of Object.keys
for (let prop of keys1) console.log(prop)
...of Object.keys.keys
for (let prop of keys2) console.log(prop)