Run results for: structuredClone vs spread vs Object.assign() vs JSON.parse

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0

Browser: Firefox 128

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Object.assign()

12.9M/s

spread syntax

3.5M/s

JSON.parse(JSON.stringify())

499K/s

structuredClone()

328K/s

View exact numbers

Test name	Executions per second
✓ Object.assign()	12,925,767 Ops/sec
spread syntax	3,543,070 Ops/sec
JSON.parse(JSON.stringify())	498,933 Ops/sec
structuredClone()	327,869 Ops/sec

Script Preparation code:

var oldObj = {
    "single": false,
    "applyOverTaxes": false,
    "discountType": "1",
    "value": 100,
    "minimumAmount": 0,
    "quantity": 1,
    "suffixLength": 8,
    "code": "IF5R0AFX",
    "vertical": true,
    "allowedPaymentMethods": null,
    "allowedBanks": null,
    "types": undefined,
    "partners": "Many",
    "startDate": "2020-10-21T00:00:00.000Z",
    "endDate": "2020-10-21T00:00:00.000Z",
    "applyed": false
}

Tests:

structuredClone()
const newObj = structuredClone(oldObj)
spread syntax
const newObj = {...oldObj}
Object.assign()
const newObj = Object.assign({}, oldObj)
JSON.parse(JSON.stringify())
const newObj = JSON.parse(JSON.stringify(oldObj))