Run results for: POJOs vs Immutable Maps

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Browser: Chrome 104

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Pojo insert	6.8 Ops/sec
Map with pojos insert	2203119.2 Ops/sec
Map with maps insert	1353708.1 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/4.1.0/immutable.min.js" integrity="sha512-OQDhbg3GkxL1XYlKM3zUzP9fYbL93uBQU6fsSl0tpr5aUp1CV3AI7hMgMVJqlCy63ppR5Ff/pk68ZjPAOjIgiQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

Script Preparation code:

var numElements = 1000000;

var pojosMap = {};
var mapWithPojos = Immutable.Map({});
var mapWithMaps = Immutable.Map({});

for (let i = 0; i < numElements; i++) {
    pojosMap[i] = { foo: i };
    mapWithPojos = mapWithPojos.set(i, { foo: i });
    mapWithMaps = mapWithMaps.set(i, Immutable.Map({ foo: i }));
}

Tests:

Pojo insert
pojosMap = { ...pojosMap, foo: { baz: 'bar' } }
Map with pojos insert
mapWithPojos = mapWithPojos.set('foo', { baz: 'bar' })
Map with maps insert
mapWithMaps = mapWithMaps.set('foo', Immutable.Map({ baz: 'bar' }))

Run results for: POJOs vs Immutable Maps

Pojo insert

Map with pojos insert

Map with maps insert