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Lodash pick vs for
(version: 2)
Comparing performance of:
Lodash vs for fields
Created:
4 years ago
by:
Registered User
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Tests:
Lodash
const obj = { a:1, b:1, c:1, d:1, e:1, f:1, g:1, h:1, i:1, } const n = _.pick(obj, ['a','d','i']);
for fields
const obj = { a:1, b:1, c:1, d:1, e:1, f:1, g:1, h:1, i:1, } const fields = [ 'a', 'd', 'i' ]; // const {a, d, i} = obj; let n = {}; for (let field of fields) { n[field] = obj[field]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Lodash
for fields
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in this benchmark. **What is being tested?** The benchmark is measuring the performance of two different approaches to extract specific fields from an object: 1. Using Lodash (`_pick` method) 2. Using a `for` loop with an array of field names (`fields`) **Options compared:** * **Lodash**: The `_pick` method is used to extract specific fields from the object. This method is part of the Lodash utility library, which provides a collection of functional programming helpers. * **For loop**: A `for` loop with an array of field names (`fields`) is used to iterate over the fields and assign their values to a new object (`n`). **Pros and Cons:** * **Lodash ( `_pick` method )**: + Pros: Concise, readable code; uses a well-known and widely-used library. + Cons: Requires an additional library download (lodash.js); might be slower due to the overhead of loading the library. * **For loop**: + Pros: No additional library required; direct access to object properties; potentially faster since it doesn't involve library overhead. + Cons: Code is more verbose and might be harder to read for some developers. **Library usage** The `pick` method from Lodash uses the following techniques: * **Object destructuring**: It takes advantage of JavaScript's object destructuring feature to extract specific fields from the original object (`obj`). * **Proxies**: Under the hood, Lodash creates a proxy object that only exposes the desired fields. This is done for performance and security reasons. **Special JS features/syntax** This benchmark uses: * **Object destructuring**: Used by the `pick` method to extract specific fields from the original object. * **Proxies**: Used by the `pick` method to create a proxy object that only exposes the desired fields. Overall, this benchmark is designed to measure the performance difference between using an established library (Lodash) and a more traditional approach with a `for` loop.
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