Run results for: lodash vs plain vanilla js performance on countby vs foreach using set

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

lodash countBy

17K/s

vanilla js foreach Iter using set

7K/s

View exact numbers

Test name	Executions per second
✓ lodash countBy	16,685 Ops/sec
vanilla js foreach Iter using set	7,251 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var products = {
                product1 : {Category: 'category1', Brand: 'brand1'},
                product2 : {Category: 'category1', Brand: 'brand2'},
                product3 : {Category: 'category2', Brand: 'brand3'},
                product4 : {Category: 'category2', Brand: 'brand3'}
         }
for(var i=5; i<900; i++) {
    (i%2==0) ? products['product'+i] = {Category: 'category'+(i-1), Brand: 'brand'+(i-1)} : 
                            products['product'+i] = {Category: 'category'+i, Brand: 'brand'+i};
}
var uniqueCategoriesPresentAcrossProducts = new Set();
var level = 'Category';
var count = 0;

Tests:

lodash countBy
_.countBy(products, level); Object.keys(products).length
vanilla js foreach Iter using set
Object.keys(products).forEach(product => uniqueCategoriesPresentAcrossProducts.add(products[product][level]) );