Benchmark: lodash reject vs filter

HTML Preparation code:

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

Tests:

omit
const foo = ['field1', 'field2', 'field3', 'field4', 'field5']; _.reject(foo, nextField => nextField === 'field4');
filter
const foo = ['field1', 'field2', 'field3', 'field4', 'field5']; _.filter(foo, nextField => nextField !== 'field4');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
omit
filter

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.

**What is being tested?**

MeasureThat.net is testing the performance of two different approaches to filter out an item from an array: `_.reject` and `_.filter`. Both functions are part of the Lodash library, which is a JavaScript utility library.

In this benchmark, two test cases are defined:

1. `_reject`: The function takes an array as input and a callback function that returns a boolean value indicating whether to include or exclude the item from the array.
2. `filter`: A similar concept, but instead of excluding items, it includes only the items for which the callback function returns `true`.

**Options compared**

The two options being compared are:

* `_reject`: Excludes an item from the array if the callback function returns `false`.
* `filter`: Includes an item in the array only if the callback function returns `true`.

**Pros and Cons of each approach:**

* `_reject`:
	+ Pros: Can be more efficient if you're trying to exclude multiple items from the array.
	+ Cons: May return fewer results than expected, as it stops iterating over the array as soon as it finds an item that matches the condition. This can lead to slower performance for large arrays.
* `filter`:
	+ Pros: More predictable behavior, as it includes all items that match the condition, and only skips them if they don't.
	+ Cons: May be less efficient than `_reject` for very large arrays, since it needs to iterate over all items before returning.

**Lodash library**

The Lodash library is a popular JavaScript utility library that provides a wide range of functions for tasks such as:

* Array manipulation (e.g., `_.filter`, `_.map`, `_.reduce`)
* Object manipulation (e.g., `_.pick`, `_.omit`, `_.clone`)
* String manipulation (e.g., `_.truncate`, `_.escape`)
* Number and math operations (e.g., `_.round`, `_.ceil`)

The Lodash library is widely used in JavaScript applications, including web development, mobile app development, and server-side programming.

**No special JS feature or syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The code uses standard JavaScript syntax and functions.

**Other alternatives**

If you don't want to use Lodash, there are other libraries and built-in functions that can perform similar operations:

* Built-in `Array.prototype.filter()` method: This is the most straightforward way to filter an array in modern JavaScript.
* Built-in `Array.prototype.indexOf()` method followed by slicing: This can be used to filter an array, but it's less efficient than using a library or built-in function like `filter()`.
* Other libraries like Underscore.js (which is similar to Lodash), Moment.js for date manipulation, or a custom implementation of the desired functionality.

In summary, the benchmark is testing the performance of two approaches: `_reject` and `filter`. The choice between these approaches depends on your specific use case and requirements.

Related benchmarks:

lodash reject vs filter (version: 0)

Comparing performance of: omit vs filter

Created: 5 years ago by: Guest

Jump to the latest result

omit

filter

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):