Run results for: Map. foreach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
forEach	6.0 Ops/sec
Array	5.1 Ops/sec

Script Preparation code:

const originalMap = new Map(Array.from({ length: 1000000 }, (_, i) => [i, i]));

Tests:

forEach
const originalMap = new Map(Array.from({ length: 1000000 }, (_, i) => [i, i])); const newMap = new Map(); originalMap.forEach((value, key) => { newMap.set(key, value * 2); }); return newMap;
Array
const originalMap = new Map(Array.from({ length: 1000000 }, (_, i) => [i, i])); const newMap = new Map( Array.from(originalMap.entries(), ([key, value]) => [key, value * 2]) );