Benchmark: Lodash Flatten v.s. concat111

HTML Preparation code:

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

Script Preparation code:

let ary = [1, [2, [3]]]

Tests:

Lodash Flatten
let ary = [1, [2, [3]]] return _.flatten(ary)
concate
let ary = [1, [2, [3]]] return [].concat(...ary)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash Flatten
concate

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is tested?**

The provided benchmark tests two approaches to flatten an array in JavaScript: using Lodash's `flatten` function and concatenating arrays using the spread operator (`...`). The test case uses a nested array `[1, [2, [3]]]`, which is a common example used to illustrate the differences between these two methods.

**Options compared**

The benchmark compares two options:

1. **Lodash's `flatten` function**: This method takes an array as input and recursively flattens it.
2. **Concatenating arrays using the spread operator (`...`)**: This method uses the spread operator to concatenate arrays, which can be more efficient than creating a new array with `Array.prototype.concat()`.

**Pros and cons of each approach**

1. **Lodash's `flatten` function**:
	* Pros: Easy to use, straightforward API.
	* Cons: Can be slower due to recursive flattening, may not perform well on very deep arrays.
2. **Concatenating arrays using the spread operator (`...`)**:
	* Pros: More efficient than Lodash's `flatten` function for large arrays, can be faster due to direct array concatenation.
	* Cons: Requires knowledge of the spread operator, may be less readable.

**Library and its purpose**

The benchmark uses Lodash, a popular JavaScript utility library that provides a set of functional programming helpers. In this case, the `flatten` function is used to flatten arrays recursively.

**Special JS feature or syntax**

The benchmark does not use any special JavaScript features or syntax other than the spread operator (`...`) for array concatenation.

**Other alternatives**

For larger-scale performance comparisons, alternative libraries like V8's internal implementation of `Array.prototype.flat()` (which is faster but less readable) and third-party libraries like Array Flattener could be used. Additionally, custom-written benchmarking code using low-level JavaScript optimizations might provide further insights into the relative performance of these two approaches.

In summary, this benchmark compares two common ways to flatten arrays in JavaScript: using Lodash's `flatten` function and concatenating arrays with the spread operator. While both methods have their pros and cons, the spread operator approach may be more efficient for large arrays due to its direct implementation.

Related benchmarks:

Lodash Flatten v.s. concat111 (version: 0)

Comparing performance of: Lodash Flatten vs concate

Created: 3 years ago by: Guest

Jump to the latest result

Lodash Flatten

concate

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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