MeasureThat.net

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

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36
Chrome 92
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
Write to map 163871.8 Ops/sec
Write to obj 138016.6 Ops/sec
Script Preparation code:
AخA
 
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();