Benchmark: lodash flatmap long

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var x = [1,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,2,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4]

Array.prototype.flatMap = function(f) {
  return [].concat(...this.map(f))
}

Tests:

lodash.flatMap
_.flatMap(x,x => [x-1, x, x+1, x +2, x +2, x +2, x +2])
native
x.flatMap(x => [x-1, x, x+1, x +2, x +2, x +2, x +2])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.flatMap
native

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Linux; Android 11; LE2123) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Mobile Safari/537.36

Browser/OS: Chrome Mobile 94 on Android

View result in a separate tab

Test name	Executions per second
lodash.flatMap	10830.6 Ops/sec
native	3428.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and test cases to understand what is being tested.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition for a JavaScript function that flattens an array using either Lodash or the native `flatMap()` method.

* **"Script Preparation Code":** This code snippet defines a custom implementation of the `Array.prototype.flatMap` method, which is then used as a test case. The implementation simply calls the original `map()` method and concatenates the results using the spread operator (`...`). This custom implementation is used to test the performance of Lodash's `flatMap` function.
* **"Html Preparation Code":** This code snippet includes a script tag that loads the Lodash library version 4.16.0 from a CDN. The purpose of this code is to ensure that the Lodash library is available for use in the benchmark.

**Individual Test Cases**

The test cases are defined as an array of objects, each representing a separate test scenario:

* **Test Case 1:** `_.flatMap(x,x => [x-1, x, x+1, x +2, x +2, x +2, x +2])` This test case uses the Lodash library's `flatMap` function to flatten an array of numbers. The `_` notation refers to the root object of the Lodash library.
* **Test Case 2:** `x.flatMap(x => [x-1, x, x+1, x +2, x +2, x +2, x +2])` This test case uses the native `flatMap()` method on an array `x`. Note that this implementation does not use the Lodash library.

**Comparison of Options**

The two test cases compare the performance of using Lodash's `flatMap` function versus the native `flatMap()` method. The pros and cons of each approach are as follows:

* **Lodash's `flatMap`:**
	+ Pros:
		- Uses a widely-used and well-tested library.
		- Provides additional functionality and features beyond the native implementation.
	+ Cons:
		- Introduces an external dependency, which can impact performance and security.
		- May incur overhead due to the use of a library.
* **Native `flatMap()` method:**
	+ Pros:
		- Does not introduce an external dependency, reducing potential performance issues.
		- Can be optimized for performance by the JavaScript engine.
	+ Cons:
		- Requires implementation of the custom `Array.prototype.flatMap` method, which can add complexity.

**Library and Its Purpose**

The Lodash library is a popular utility library that provides a wide range of functional programming helpers, including array manipulation functions like `flatMap`. The purpose of using Lodash in this benchmark is to evaluate the performance difference between the native implementation and the widely-used library.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark. However, it's worth noting that the use of the spread operator (`...`) in the custom implementation of `Array.prototype.flatMap` is a relatively recent feature introduced in ECMAScript 2015 (ES6).

**Alternatives**

If you want to write your own native `flatMap()` method or use a different library for array manipulation, here are some alternatives:

* For a custom implementation: You can define a new function that takes an array and a callback function as arguments, and returns a new array with the results of calling the callback function on each element.
* For a different library: There are many other utility libraries available, such as jQuery's `map()` and `filter()` methods or third-party libraries like Ramda.

Keep in mind that using a native implementation or a custom library may require additional work to ensure compatibility with different browsers and environments.

Related benchmarks:

lodash flatmap long (version: 0)

Comparing performance of: lodash.flatMap vs native

Created: 3 years ago by: Guest

Jump to the latest result

lodash.flatMap

native

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):