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Run results for:
Map vs Object with Number Keys
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Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0
Browser:
Firefox 140
Operating system:
Linux
Device Platform:
Desktop
Date tested:
11 months ago
Test name
Executions per second
Iterate Object
295.8 Ops/sec
Iterate Map
1060.7 Ops/sec
Script Preparation code:
var object = Object.fromEntries(new Array(100000).fill(1).map((_, i) => [Math.random() * 100000 | 0, 'value'])); var map = new Map(Object.entries(object));
Tests:
Iterate Object
let lastValue = ''; for (var key in object) lastValue = object[key];
Iterate Map
let lastValue = ''; for (var [key, value] of map) lastValue = value;