Run results for: object spread vs object index vs map set

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.97 Safari/537.36

Browser: Chrome 96

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
object update with spread operator	2739.1 Ops/sec
object update with indexing	53870.3 Ops/sec
map update	24568.5 Ops/sec

Tests:

object update with spread operator
let obj = {} for (let i = 0; i < 1000; i++) { obj = {...obj, [i]: (i || 0) + 1} }
object update with indexing
const obj = {} for (let i = 0; i < 1000; i++) { obj[i] = (obj[i] || 0) + 1 }
map update
const map = new Map() for (let i = 0; i < 1000; i++) { map.set(i, (map.get(i) || 0) + 1) }