Run results for: For in vs For object.keys() vs lodash each

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser: Chrome 139

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

For object keys

68.2M/s

For in

9.4M/s

Lodash each

4.9M/s

View exact numbers

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var obj = {a:1, b:2, c:3, d:4, f:5, h:6, j:7, i:8, k:9, o:0};

Tests:

For in
var result = {}; for(let i in obj) { result[i] = obj[i]; }
For object keys
var result = {}; var keys = Object.keys(obj); for(let i=0; i<obj.length; ++i) { result[i] = obj[i]; }
Lodash each
var result = {}; _.each(obj, (v, i) => result[i] = v);