Run results for: object spread vs immutable-js corrected v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Browser: Chrome 92

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
object spread	55.4 Ops/sec
immutable-js	11.3 Ops/sec
No copying	491.2 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/immutability-helper@2.7.0/index.min.js"></script>

Tests:

object spread
const obj = {}; for(i=0;i<100000;i++){ obj[i] = 'some long string which will need to be copied'; } const obj2 = {key: 'This is final object'} const final = {obj2, ...obj}; for(i=0;i<100000;i++){ final[i] = 'some long string which will need to be copied'; }
immutable-js
const obj = {}; for(i=0;i<100000;i++){ obj[i] = 'some long string which will need to be copied'; } const immObj = Immutable.Map(obj); const obj2 = {key: 'This is final object'} const final = immObj.merge(obj2); for(i=0;i<100000;i++){ final.set(i,'some long string which will need to be copied'); }
No copying
const obj = {key: 'This is final object'}; for(i=0;i<100000;i++){ obj[i] = 'some long string which will need to be copied'; } for(i=0;i<100000;i++){ obj[i] = 'some long string which will need to be copied'; }

Run results for: object spread vs immutable-js corrected v2

object spread

immutable-js

No copying