Map vs Object with Number Keys
Date tested:
5 months ago
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Test name
Executions per second
Iterate Object
416.0 Ops/sec
Iterate Map
4357.1 Ops/sec
Benchmark definition (click to collapse):
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;
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