Run results for: shallow clone object vs map copy vs strucutredClone

Run details:

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: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Map shallow clone

1K/s

Object shallow clone

293/s

Map structuredClone

135/s

Object structuredClone

106/s

View exact numbers

Test name	Executions per second
✓ Map shallow clone	1,079 Ops/sec
Object shallow clone	293 Ops/sec
Map structuredClone	135 Ops/sec
Object structuredClone	106 Ops/sec

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))

Run results for: shallow clone object vs map copy vs strucutredClone

Object shallow clone

Map shallow clone

Object structuredClone

Map structuredClone

Object JSON.stringify copy