Run results for: Object spread vs New map with string keys

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser: Chrome 103

Operating system: Mac OS X 10.14.4

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Obj spread	16.4 Ops/sec
new Map	74.1 Ops/sec

Script Preparation code:

var data = new Array(100000).fill(undefined).map((_,i) => i)
var obj = data.reduce((obj, idx) => {obj['idx' + idx] = idx; return obj}, {});
var map = new Map(Object.entries(obj));

Tests:

Obj spread
let a = {...obj};
new Map
let a = new Map(map);

Run results for: Object spread vs New map with string keys

Obj spread

new Map