Run results for: test1: for...in vs Object.keys().forEach();

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36

Browser: Chrome 84

Operating system: Mac OS X 10.15.5

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
for in	3252.8 Ops/sec
object.keys	3670.4 Ops/sec

Tests:

for in
const ob = Array.from({ length: 100 }, (_, i) => i).reduce((acc, item) => { const value = Math.random(); const key = btoa(value.toString()); acc[key] = value; return acc; }, {}); for(const key in ob) { ob[key] += 1; };
object.keys
const ob = Array.from({ length: 100 }, (_, i) => i).reduce((acc, item) => { const value = Math.random(); const key = btoa(value.toString()); acc[key] = value; return acc; }, {}); Object.keys(ob).forEach(key => { ob[key] += 1; });