Run results for: foreach: array vs object keys vs object values vs object entries

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser: Firefox 142

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

array

629K/s

object with values

317K/s

object with keys

102K/s

object with entries 1

65K/s

object with entries 2

53K/s

View exact numbers

Script Preparation code:

var arr = [];
var obj = {};

for (i = 0; i < 1000; ++i) {
  arr.push(i);
  obj[i] = i;
}

Tests:

array
arr.forEach( (item) => item, );
object with keys
Object.keys(obj).forEach( (key) => key, );
object with values
Object.values(obj).forEach( (value) => value, );
object with entries 1
Object.entries(obj).forEach( (entry) => entry, );
object with entries 2
Object.entries(obj).forEach( ([key, value]) => [key, value], );