Run results for: Map vs Object - string keys - read performance

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Browser: Chrome 91

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Read from map	2089018.0 Ops/sec
Read from obj	1645443.8 Ops/sec

Script Preparation code:

window.myMap = new Map();
window.myObj = new Map();
window.generateObj = () => ({
    'a': Math.random() * 10000,
    'b': Math.random() * 10000,
    'c': Math.random() * 10000
});

for (let i = 0; i < 1000; i++) {
    let id = 'id-' + i;
    let obj = generateObj();
    myMap.set(id, obj);
    myObj[id] = obj;
}

Tests:

Read from map
let id = `id-` + Math.floor(Math.random() * 1000); let value = myMap.get(id);
Read from obj
let id = `id-` + Math.floor(Math.random() * 1000); let value = myObj[id];

Run results for: Map vs Object - string keys - read performance

Read from map

Read from obj