Run results for: foreach vs spread operator 2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/110.0.5481.83 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 110

Operating system: iOS 15.6

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
forEach	6598867.0 Ops/sec
spread operator	2691050.0 Ops/sec

Tests:

forEach
var a = {'1': 1, '2': 2, '3': 3, '4': 4} var b = [{id: 5}, {id: 6}, {id: 7}, {id: 8}] b.forEach(x => { a[x.id] = x })
spread operator
var a = {'1': 1, '2': 2, '3': 3, '4': 4} var b = [{id: 5}, {id: 6}, {id: 7}, {id: 8}] a = {...a, ...b.reduce((obj, item) => { obj[item.id]; return obj }, {})}

Run results for: foreach vs spread operator 2

Compare the new ES6 spread operator with the traditional concat() method

forEach

spread operator