Run results for: map vs object - key access

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Object access	17514.1 Ops/sec
Map get	13777.9 Ops/sec

Script Preparation code:

var items = Array.from(Array(1000), (_, x) => ({
    key: x,
    value: x * 10
}));

var objContainer = {};
var mapContainer = new Map();

for (let i = 100; i >= 0; i--) {
    const index = Math.floor(Math.random() * 1000);
    const item = items[index];
    objContainer[item.key] = item;
    mapContainer.set(item.key, item)
}

Tests:

Object access
items.forEach(item => objContainer[item.value])
Map get
items.forEach(item => mapContainer.get(item.value))

Run results for: map vs object - key access

Object access

Map get