Benchmark: Lodash flattern vs flat

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js'></script>

Tests:

Array flat
const arrayA = ['hi', 'hi', 'hi', 'hi']; const arrayB = ['hi', 'hi', 'hi', 'hi']; const flattened = [ arrayA, arrayB ].flat(); console.log(flattened);
Lodash flatten
const arrayA = ['hi', 'hi', 'hi', 'hi']; const arrayB = ['hi', 'hi', 'hi', 'hi']; const flattened = _.flatten([ arrayA, arrayB ]); console.log(flattened);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array flat
Lodash flatten

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array flat	154745.2 Ops/sec
Lodash flatten	161782.2 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the explanation into smaller sections to make it easier to understand.

**Benchmark Overview**

The benchmark compares two approaches for flattening arrays in JavaScript: `flat()` and `_flatten()` from Lodash library.

**Options Compared**

Two options are compared:

1. **`flat()`**: This is a built-in method of JavaScript arrays, introduced in ECMAScript 2019 (ES2019). It returns a new array with all sub-array elements concatenated into it.
2. **`_flatten()` from Lodash library**: Lodash is a utility library that provides various helper functions for JavaScript development. The `_flatten()` function is used to flatten an array of arrays.

**Pros and Cons**

Here are the pros and cons of each approach:

1. **`flat()`**:
	* Pros: Native implementation, high performance, easy to use.
	* Cons: Requires ECMAScript 2019 (ES2019) support, may have performance issues in older browsers or environments.
2. **`_flatten()` from Lodash library**:
	* Pros: Widely supported by older browsers and environments, easier to implement than `flat()`, provides additional utility functions.
	* Cons: Requires an external library, slightly slower than `flat()`, may have memory usage issues.

**Lodash Library**

The `_flatten()` function is part of the Lodash library. It takes an array of arrays as input and returns a new array with all sub-array elements concatenated into it.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax used in this benchmark. Both approaches use standard JavaScript syntax.

**Other Considerations**

When choosing between `flat()` and `_flatten()`, consider the following:

* If you need to support older browsers or environments, Lodash might be a better choice.
* If you're working with large datasets or performance-critical code, `flat()` might be a better option due to its native implementation and high performance.

**Alternatives**

Other alternatives for flattening arrays in JavaScript include:

1. **Array.prototype.concat()**: This method concatenates one or more arrays into a new array.
2. **Array.prototype.reduce()**: This method reduces an array of arrays into a single array using a callback function.
3. **Array.prototype.map() + Array.prototype.concat()**: This approach uses `map()` to flatten the inner arrays and then concatenates them using `concat()`.

However, these alternatives may have performance issues or require additional setup compared to `flat()` and `_flatten()`.

Related benchmarks:

Lodash flattern vs flat (version: 0)

Comparing performance of: Array flat vs Lodash flatten

Created: 2 years ago by: Guest

Jump to the latest result

Array flat

Lodash flatten

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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