Benchmark: lodash filter vs native map

HTML Preparation code:

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

Script Preparation code:

var testArray = [];
for (var i = 0; i < 10000; i++) {
  testArray.push(Math.floor(Math.random(i * 1000) * 100))
}

Tests:

test one
function filterElement(testArray) { return testArray.filter(a => a<10) } filterElement(testArray);
test two
function mapElement(testArray) { return testArray.map(a => { if(a<10) return a; }) } mapElement(testArray);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test one
test two

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

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

**Overview**

The benchmark compares the performance of two approaches: filtering an array using Lodash (`lodash.filter`) versus mapping an array and then filtering the result using the conditional operator (`a < 10`).

**Options compared**

There are two options being compared:

1. `filterElement`: This function uses `Lodash's `filter` method to filter the `testArray`. The `filter` method takes a callback function as an argument, which is executed for each element in the array.
2. `mapElement`: This function uses `Array.prototype.map()` to create a new array with the same number of elements as the original array. It then uses a conditional expression (`if (a < 10) return a`) to filter out elements greater than or equal to 10.

**Pros and Cons**

* **`filterElement`:**
	+ Pros:
		- Concise and easy to read
		- Leverages the power of Lodash's optimized filtering algorithm
	+ Cons:
		- May incur a higher overhead due to the need to import Lodash
		- Limited control over the filtering process (only allows filtering by a single condition)
* **`mapElement`:**
	+ Pros:
		- Offers more flexibility and control over the filtering process
		- Can be easily extended to filter on multiple conditions
	+ Cons:
		- More verbose and harder to read than `filterElement`
		- Requires explicit looping to create a new array, which can lead to performance overhead

**Lodash library**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, string manipulation, object manipulation, and more. In this benchmark, the `lodash.filter` function is used to filter the `testArray`. The `filter` method takes two arguments: an array to filter and a callback function.

**Other considerations**

* **Performance**: Both approaches have their performance trade-offs. `filterElement` may be faster due to Lodash's optimized filtering algorithm, but `mapElement` offers more control over the filtering process.
* **Code readability and maintainability**: While `mapElement` is more verbose, it provides more explicit logic for filtering the array.

**Other alternatives**

If you're interested in exploring other approaches or libraries, here are a few options:

* **Vanilla JavaScript**: You can use traditional JavaScript methods like `Array.prototype.filter()` without relying on Lodash.
* **Other filtering libraries**: Libraries like Ramda (similar to Lodash) or Fastify's built-in filtering functionality may offer alternative solutions.

Keep in mind that performance, readability, and maintainability considerations will influence your choice of approach.

Related benchmarks:

lodash filter vs native map (version: 0)

Comparing performance of: test one vs test two

Created: 5 years ago by: Guest

Jump to the latest result

test one

test two

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):