Benchmark: lodash find vs lodash findIndex2

HTML Preparation code:

<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': 28 },
  { 'user': 'ross',    'age': 31 },
  { 'user': 'chandler', 'age': 30 },
  { 'user': 'jessika', 'age': 21 },
  { 'user': 'amanda', 'age': 17 }
]

Tests:

lodash find
_.find(users, user => user.age === 30)
_.findIndex
_.findIndex(users, u => u.age === 30)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash find
_.findIndex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the details of what's being tested in this JavaScript microbenchmark, MeasureThat.net.

**Benchmark Overview**

The benchmark is comparing the performance of two methods from the popular JavaScript utility library, Lodash:

1. `_.find(users, user => user.age === 30)`
2. `_.findIndex(users, u => u.age === 30)`

These two methods are used to find and index elements in an array that match a specific condition.

**What's being compared?**

In essence, the benchmark is comparing the performance of these two methods when searching for an element in the `users` array based on the age attribute. The difference lies in how they achieve this:

* `_find` returns the first element in the array that passes the test (i.e., has an age equal to 30). If no such element is found, it returns `undefined`.
* `_findIndex` returns the index of the first element in the array that passes the test. If no such element is found, it returns `-1`.

**Pros and Cons**

Here are some pros and cons associated with each approach:

* `_find`: Pros:
	+ More readable and concise code.
	+ Suitable for scenarios where you want to return a value (e.g., an object) instead of an index.
Cons:
	+ May be slower due to the need to traverse the array until the condition is met.
* `_findIndex`: Pros:
	+ Faster, as it only needs to iterate over the array once to find the first matching element.
Cons:
	+ Returns an index, which may not be as intuitive for some developers.
	+ May require additional processing to convert the index to a meaningful value (e.g., an object).

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions and methods to perform common tasks. The `find` and `findIndex` functions are part of this library, making it easy to add functionality to your code without having to implement these operations from scratch.

In the benchmark, the `users` array is created with sample data, and Lodash's `lodash.min.js` file is included in the HTML preparation code. This ensures that both methods are executed on the same context with the same environment variables set.

**Special JavaScript Feature: Closures**

Both test cases use a closure to define the callback function for each method. A closure is a function that has access to its own scope, including variables from its outer context. In this case, the closure captures the `user` and `u` variables, which are used in the callback functions.

Closures can be an effective way to encapsulate data and behavior, making code more modular and reusable. However, they can also add complexity to the codebase, especially when debugging or maintaining large applications.

**Other Alternatives**

If you're looking for alternative libraries or implementations of these methods, here are a few options:

* `Array.prototype.find` and `Array.prototype.findIndex`: These are part of the modern JavaScript standard library (ECMAScript 2015+). They provide similar functionality to Lodash's `find` and `findIndex`, but with a more concise syntax.
* Custom implementations: You can implement these methods yourself using loops or recursion, depending on your preferences. However, this approach may be less efficient and less maintainable than using an existing library.

In conclusion, the MeasureThat.net benchmark provides a simple yet informative way to compare the performance of two popular JavaScript utility functions from Lodash. By understanding the differences between `_find` and `_findIndex`, developers can make informed decisions about which approach to use in their own codebase, taking into account factors like readability, performance, and maintainability.

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser/OS: Chrome 125 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash find	6496235.0 Ops/sec
_.findIndex	7413654.5 Ops/sec

Related benchmarks:

lodash find vs lodash findIndex2 (version: 1)

Compare performance of _.find and _.findIndex

Comparing performance of: lodash find vs _.findIndex

Created: 2 years ago by: Registered User

Jump to the latest result

lodash find

_.findIndex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):