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: 9 months ago

array-backed map

21.0M/s

map values

7.5M/s

map entries

6.6M/s

map

6.5M/s

View exact numbers

Test name	Executions per second
✓ array-backed map	20,964,914 Ops/sec
map values	7,508,382 Ops/sec
map entries	6,609,362 Ops/sec
map	6,524,096 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) }