Benchmark: lodash flatten vs native flat with nested objects

HTML Preparation code:

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

Tests:

Lodash with objects
const arr = [[{ name: 'bort' }, { name: 'dort' }, { name: 'bort' }, { name: 'dort' }], [{ name: 'bort' }, { name: 'dort' }, { name: 'bort' }, { name: 'dort' }]]; _.flatten(arr);
Native flat with objects
const arr = [[{ name: 'bort' }, { name: 'dort' }, { name: 'bort' }, { name: 'dort' }], [{ name: 'bort' }, { name: 'dort' }, { name: 'bort' }, { name: 'dort' }]]; arr.flat();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash with objects
Native flat with objects

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Lodash with objects	4689173.5 Ops/sec
Native flat with objects	828872.4 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the explanation.

**Benchmark Definition JSON**

The provided JSON represents a JavaScript benchmark test case for measuring the performance of two approaches: using Lodash's `flatten()` function and native `flat()` method with nested objects.

**Options Compared**

Two options are compared in this benchmark:

1. **Lodash's `flatten()` function**: This is a utility function from the popular JavaScript library Lodash that flattens an array (or any other iterable) into a one-dimensional array.
2. **Native `flat()` method**: This is a native JavaScript method introduced in ECMAScript 2019 (ES2020) that can be used to flatten arrays.

**Pros and Cons of Each Approach**

Here are the pros and cons of each approach:

* **Lodash's `flatten()` function**:
	+ Pros: widely supported, well-documented, and extensively tested. It also provides additional functionality like handling nested arrays.
	+ Cons: adds an extra dependency on Lodash, which may not be desirable for smaller projects or those with specific dependencies restrictions.
* **Native `flat()` method**:
	+ Pros: no extra dependency required, efficient, and part of the standard JavaScript library.
	+ Cons: requires ES2020 support (and possibly additional polyfills if needed), and its behavior might differ from expected due to how it handles nested arrays.

**Library Used**

In this benchmark, Lodash is used as a third-party library. The `flatten()` function is a key part of Lodash's utility belt, providing a simple way to flatten arrays into one-dimensional arrays.

**Special JavaScript Feature or Syntax**

No special JavaScript features or syntax are mentioned in the provided benchmark definition or test cases. However, it's worth noting that ES2020 introduced several new features and methods, including `flat()` and other array-related improvements.

**Other Alternatives**

If you're interested in exploring alternative approaches to flatten arrays, some other options include:

* Using a library like Lo-Dash (a smaller, more lightweight alternative to Lodash)
* Utilizing other third-party libraries like Ramda or Underscore.js
* Implementing your own array flattening function from scratch
* Leveraging modern JavaScript features like `flatMap()` or `reduce()`

Related benchmarks:

lodash flatten vs native flat with nested objects (version: 0)

Comparing performance of: Lodash with objects vs Native flat with objects

Created: one year ago by: Guest

Jump to the latest result

Lodash with objects

Native flat with objects

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):