Benchmark: lodash flatten vs concat

HTML Preparation code:

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

Tests:

spread
const arrayA = ['hi', 'hi', 'hi', 'hi']; const arrayB = ['hi', 'hi', 'hi', 'hi']; const flattened = [].concat(...[ arrayA, arrayB ]) console.log(flattened);
lodash flatten
const arrayA = ['hi', 'hi', 'hi', 'hi']; const arrayB = ['hi', 'hi', 'hi', 'hi']; const flattened = []; const sourceObject = [ arrayA, arrayB ]; sourceObject.forEach((array) => { flattened.push(array) }); _.flatten(flattened); console.log(flattened);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
lodash flatten

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmark and explain what's being tested.

**Overview**

The benchmark is comparing two ways to concatenate arrays in JavaScript: using `concat()` or spreading operators (`...`). The test is also including a third option using the Lodash library, which provides a `flatten()` function for flattening arrays.

**Options compared**

1. **Spreading operators (`...`)**:
This method uses the spread operator to concatenate two arrays into one. It's a modern JavaScript feature introduced in ECMAScript 2018 (ES10). When used with `concat()`, it creates a new array by copying elements from both input arrays.
```javascript
const flattened = [].concat(...[arrayA, arrayB]);
```
Pros:

* Efficient and concise way to concatenate arrays.
* Fast execution.

Cons:

* Introduced in ES2018, making it incompatible with older browsers or environments.
* May not be supported in older JavaScript versions.

2. **Lodash `flatten()` function**:
This method uses the Lodash library to flatten an array of arrays into a single array.
```javascript
const flattened = _.flatten(flattened);
```
Pros:

* Well-established and widely supported library (4.17.5 version used).
* Compatible with older JavaScript versions.

Cons:

* Requires including the Lodash library in your codebase, which may add extra size to your bundle.
* May have slower execution compared to spreading operators.

**Other considerations**

* **Performance**: Both spreading operators and Lodash `flatten()` have similar performance characteristics. However, spreading operators are generally faster due to their optimized implementation.
* **Readability**: Spreading operators provide a concise and readable way to concatenate arrays, while the Lodash function may be less intuitive for some developers.

**Library usage**

In this benchmark, Lodash is used as an external library to provide a `flatten()` function. The script preparation code includes the Lodash library, allowing users to use it in their tests.

**Special JS features or syntax**

There are no special JavaScript features or syntax used in these test cases. The focus is on comparing three different methods for concatenating arrays.

Related benchmarks:

lodash flatten vs concat (version: 0)

lodash flatten vs spread

Comparing performance of: spread vs lodash flatten

Created: 3 years ago by: Registered User

Jump to the latest result

spread

lodash flatten

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):