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

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Run details:
Mozilla/5.0 (Linux; Android 9; G8142) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.120 Mobile Safari/537.36
Chrome Mobile 91
Android
Mobile
3 years ago
Test name Executions per second
Write to map 24780.5 Ops/sec
Write to obj 23302.1 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();