Run results for: Object spread vs New map

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.2

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Obj spread	105.0 Ops/sec
new Map	560.0 Ops/sec

Script Preparation code:

var data = new Array(100000).fill(undefined).map((_,i) => i)
var obj = data.reduce((obj, idx) => {obj[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

Obj spread

new Map