Run results for: iterate over map vs map entries vs map values vs array-backed map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser: Firefox 144

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
map	6524096.5 Ops/sec
array-backed map	20964914.0 Ops/sec
map entries	6609362.5 Ops/sec
map values	7508382.0 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const map = new Map([[1,null],[2, null],[3, null],[4, null]])
const array = [1,2,3,4]
const mapWithArray = new Map([[1,null],[2, null],[3, null],[4, null]])
function getStructures() {
 return { map, array, mapWithArray } 
}

Tests:

map
const {map, array, mapWithArray} = getStructures() for (const [key, value] of map) { key; value; }
array-backed map
const {map, array, mapWithArray} = getStructures() for (const key of array) { key; mapWithArray.get(key) }
map entries
const {map, array, mapWithArray} = getStructures() const entries = map.entries() for (const [key, value] of entries) { key; value; }
map values
const {map, array, mapWithArray} = getStructures() const values = map.values() for (const key of values) { key; mapWithArray.get(key) }