Run results for: For in vs Object.*.forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:84.0) Gecko/20100101 Firefox/84.0

Browser: Firefox 84

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var obj = new Object()
var keys = (new Array(10000)).fill(0).map((x, i) => { return i + 1 })
keys.forEach((x) => { obj['prop' + x] = x })

Tests:

For In
for (var key in obj) { if (obj.hasOwnProperty(key)) console.log(obj[key]) }
Object values forEach
Object.values(obj).forEach(value => console.log(value))
Object keys forEach
Object.keys(obj).forEach(key => console.log(obj[key]))
Object entries forEach
Object.entries(obj).forEach(([key, value]) => console.log(key,'->',value))