Run results for: Map copying

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser: Chrome 118

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
From map	1514.0 Ops/sec
From array	1113.0 Ops/sec
Step-by-step	1241.9 Ops/sec

Script Preparation code:

const array = Array.from({length: 10_000}, () => Math.floor(Math.random() * 10_000_000));
const map = new Map();
array.forEach((x, i) => map.set(x, i));

Tests:

From map
return new Map(map);
From array
return new Map([...map])
Step-by-step
const newMap = new Map(); map.keys().forEach(x => newMap.set(x, map.get(x))); return newMap

Run results for: Map copying

From map

From array

Step-by-step