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Run results for:
POJO hash table vs Map
Benchmark of various iteration and diffing strategies over a plain JavaScript-object-as-hash-table vs the ES6 Map data structure
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<iframe src="https://measurethat.net/Embed?id=573205" width="100%" height="500px"></iframe>
Run details:
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
Browser:
Chrome 131
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
Map - forEach
30K/s
POJO - for...in
18K/s
Map - for...of entries
10K/s
POJO - reduce Object.entries
9K/s
POJO - for...of Object.entries
9K/s
View exact numbers
Test name
Executions per second
✓
Map - forEach
30,065 Ops/sec
POJO - for...in
18,141 Ops/sec
Map - for...of entries
10,230 Ops/sec
POJO - reduce Object.entries
9,125 Ops/sec
POJO - for...of Object.entries
8,699 Ops/sec
Script Preparation code:
var pojo1 = {}; var pojo2 = {}; var map1 = new Map(); var map2 = new Map(); for (var i = 0; i < 300; i++) { var val1 = Math.round(Math.random() * 10); var val2 = Math.round(Math.random() * 10); pojo1[`${i}`] = val1; map1.set(`${i}`, val1); pojo2[`${i}`] = val2; map2.set(`${i}`, val2); }
Tests:
POJO - for...in
var diff = []; for (var key in pojo1) { if (pojo1.hasOwnProperty(key)) { if (pojo1[key] !== pojo2[key]) { diff.push(key); } } }
POJO - for...of Object.entries
var diff = []; for (var [key, val] of Object.entries(pojo1)) { if (val !== pojo2[key]) { diff.push(key); } }
POJO - reduce Object.entries
var diff = Object.entries(pojo1).reduce((acc, [key, val]) => { if (val !== pojo2[key]) { acc.push(key); } return acc; }, []);
Map - forEach
var diff = []; map1.forEach((val, key) => { if (val !== map2.get(key)) { diff.push(key); } });
Map - for...of entries
var diff = []; for (var [key, val] of map1.entries()) { if (val !== map2.get(key)) { diff.push(key); } }