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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0

Browser: Firefox 146

Operating system: Windows

Device Platform: Desktop

Date tested: 7 months ago

Write to map

189K/s

Write to obj

188K/s

View exact numbers

Test name	Executions per second
✓ Write to map	188,732 Ops/sec
Write to obj	188,330 Ops/sec

Script Preparation code:

window.myObj = {};
window.myMap = new Map();
window.generateId = () => new Date().toISOString() + '=' + Math.random();
window.generateObj = () => ({
    'a': generateId(),
    'b': generateId(),
    'c': generateId()
});

Tests:

Write to map
myMap.set(generateId(), generateObj());
Write to obj
myObj[generateId()] = generateObj();