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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Browser: Chrome 78

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Object.keys	1738787.0 Ops/sec
for in	2588623.0 Ops/sec

Tests:

Object.keys
const simpleObject = {a: 'a', b: 'b', 1: 1, 2: 2, longProp: 'longProp'}; let index = 0; Object.keys(simpleObject).forEach(propValue => ++index);
for in
const simpleObject = {a: 'a', b: 'b', 1: 1, 2: 2, longProp: 'longProp'}; let index = 0; for(const prop in simpleObject) { ++index; }