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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser: Chrome 141

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
map	79446616.0 Ops/sec
array-backed map	178940432.0 Ops/sec
map entries	81931488.0 Ops/sec
map values	137471920.0 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) }