Benchmark: iterate over map vs array-backed map

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) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
array-backed map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

array-backed map

53.7M/s

map

18.9M/s

View exact numbers

Test name	Executions per second
✓ array-backed map	53,697,336 Ops/sec
map	18,945,658 Ops/sec

iterate over map vs array-backed map (version: 1)

Comparing performance of: `map vs array-backed map`

Created: 9 months ago by: Registered User

Go to the latest result

map

array-backed map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

iterate over map vs array-backed map (version: 1)

Comparing performance of: map vs array-backed map

Created: 9 months ago by: Registered User

Go to the latest result

map

array-backed map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `map vs array-backed map`