Run results for: structuredClone vs Object cloning for `Map<number, Set<number>>`

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object cloning	1850.0 Ops/sec
structuredClone	668.4 Ops/sec

Script Preparation code:

const array_from = Array.from
const math_random = Math.random

function mapToObject (map) {
	const obj = {}
	map.forEach((value, key) => {
		obj[key] = array_from(value)
	})
	return obj
}

const randInt = (min, max) => ((math_random() * (max - min) + min) | 0)
var map_obj = new Map()
const add_random_entry = () => {
	map_obj.set(randInt(0, 2000), new Set(
		Array(randInt(0, 20)).fill(0).map(
			() => randInt(-500, 500)
		)
	))
}
for (let i = 0; i < 500; i++) { add_random_entry() }

Tests:

Object cloning
let obj = mapToObject(map_obj) // ensure that jit does not simply jump to disposing of obj obj[12] ? (obj[12][0] += 1) : delete obj[12] obj = undefined
structuredClone
let map_cloned = structuredClone(map_obj) // ensure that jit does not simply jump to disposing of map_cloned map_cloned.get(12) ? (map_cloned.get(12).add(-1)) : (map_cloned.set(12, new Set([5, 5, 5]))) map_cloned = undefined