Benchmark: native findLastIndex vs lodash _.findLastIndex

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.core.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var users = [
  { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'chandler', 'age': 39 }
]

Tests:

array findLastIndex
// Native users.findLastIndex(function (o) { return o.age === 41; })
_.findLastIndex
_.findLastIndex(users, function (o) { return o.age === 41; })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array findLastIndex
_.findLastIndex

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and analyze the provided benchmark.

**Benchmark Definition**

The benchmark compares two approaches: using native JavaScript ( built-in function `findLastIndex`) versus using the popular utility library Lodash (`_.findLastIndex`). The goal is to determine which approach is faster in terms of performance.

**Options Compared**

Two options are compared:

1. **Native findLastIndex**: This uses the built-in JavaScript function `findLastIndex` on an array.
2. **Lodash _.findLastIndex**: This uses the Lodash library's implementation of `findLastIndex`, which is a wrapper around the native JavaScript function.

**Pros and Cons**

**Native findLastIndex**

Pros:

* Faster execution time, as it doesn't require additional overhead from the Lodash library.
* Smaller binary size, as it only includes the native JavaScript functions.

Cons:

* Limited functionality compared to Lodash's implementation, which provides additional features like handling null or undefined values.

**Lodash _.findLastIndex**

Pros:

* More robust and feature-rich implementation, providing support for various edge cases (e.g., handling null or undefined values).
* Easier to use, as it follows a consistent naming convention and syntax.

Cons:

* Slower execution time due to the added overhead from the Lodash library.
* Larger binary size compared to the native JavaScript function.

**Library: Lodash**

Lodash is a popular utility library for JavaScript that provides a collection of functional programming helpers. In this benchmark, `_` is used as an alias for the `lodash` namespace. The `findLastIndex` function in Lodash wraps around the native JavaScript function and provides additional features like null or undefined value handling.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes mentioned in this benchmark.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

* **Underscore.js**: Similar to Lodash, but with fewer dependencies and a more minimalist approach.
* **Array.prototype.findLastIndex()**: Some browsers (like Chrome) have implemented the `findLastIndex()` method on the Array prototype. This would eliminate the need for either native or Lodash implementation.

In summary, MeasureThat.net provides a straightforward comparison between using native JavaScript's `findLastIndex` and Lodash's `_findLastIndex`. While native is likely to be faster, Lodash offers more features and might be preferred in certain scenarios.

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array findLastIndex	23438576.0 Ops/sec
_.findLastIndex	8558204.0 Ops/sec

Related benchmarks:

native findLastIndex vs lodash _.findLastIndex (version: 3)

Compare lodash findLastIndex with native reverse and findIndex.

Comparing performance of: array findLastIndex vs _.findLastIndex

Created: 10 months ago by: Registered User

Jump to the latest result

array findLastIndex

_.findLastIndex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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