Benchmark: shallow clone object vs map copy vs strucutredClone

Script Preparation code:

const entries = Array.from({
        length: 10_000
    }, (_, i) => i)
    .map(i => [
        `key${i}`,
        {
            a: Math.random() * 10000,
            b: Math.random().toString(36).slice(2)
        }
    ])


var obj = Object.fromEntries(entries);
var map = new Map(entries);

Tests:

Object shallow clone
const banana = {...obj}
Map shallow clone
const coconut = new Map(map)
Object structuredClone
const pineapple = structuredClone(obj)
Map structuredClone
const mango = structuredClone(map)
Object JSON.stringify copy
const papaya = JSON.parse(JSON.stringify(obj))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object shallow clone
Map shallow clone
Object structuredClone
Map structuredClone
Object JSON.stringify copy

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/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
Object shallow clone	283.4 Ops/sec
Map shallow clone	1131.1 Ops/sec
Object structuredClone	103.2 Ops/sec
Map structuredClone	133.5 Ops/sec
Object JSON.stringify copy	128.1 Ops/sec

Related benchmarks:

shallow clone object vs map copy vs strucutredClone (version: 2)

Comparing performance of: Object shallow clone vs Map shallow clone vs Object structuredClone vs Map structuredClone vs Object JSON.stringify copy

Created: one year ago by: Registered User

Jump to the latest result

Object shallow clone

Map shallow clone

Object structuredClone

Map structuredClone

Object JSON.stringify copy

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A