Benchmark: Map copying - MeasureThat.net

Script Preparation code:

const array = Array.from({length: 10_000}, () => Math.floor(Math.random() * 10_000_000));
const map = new Map();
array.forEach((x, i) => map.set(x, i));

Tests:

From map
return new Map(map);
From array
return new Map([...map])
Step-by-step
const newMap = new Map(); map.keys().forEach(x => newMap.set(x, map.get(x))); return newMap

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
From map
From array
Step-by-step

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Windows

View result in a separate tab

Test name	Executions per second
From map	1514.0 Ops/sec
From array	1113.0 Ops/sec
Step-by-step	1241.9 Ops/sec

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set + array.from + map vs map + set
Performance of JavaScript .forEach, for in
Performance of JavaScript .forEach, for in v3
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Iterator to Array Benchmark
Map. foreach
Map iteration + clearing
Map.values().toArray() vs Array.from(Map.values()) vs [...Map.values()]

Map copying (version: 1)

Comparing performance of: From map vs From array vs Step-by-step

Created: one year ago by: Registered User

Jump to the latest result

From map

From array

Step-by-step

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A