Benchmark: native findIndex vs lodash find element

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',  'cA': {"currency": "wadd","value": 0}, 'TA': {"currency": "wadd","value": 0}, 'PA': {"currency": "wadd","value": 0} },
  { 'user': 'ross',  'cA': {"currency": "wadd","value": 0}, 'TA': {"currency": "wadd","value": 0}, 'PA': {"currency": "wadd","value": 0},  'age': 31 },
  { 'user': 'chandler', 'cA': {"currency": "wadd","value": 0}, 'TA': {"currency": "wadd","value": 0}, 'PA': {"currency": "wadd","value": 0},'age': 30 },
  { 'user': 'jessika','cA': {"currency": "wadd","value": 0}, 'TA': {"currency": "wadd","value": 0}, 'PA': {"currency": "wadd","value": 0}, 'age': 21 },
  { 'user': 'amanda', 'cA': {"currency": "wadd","value": 0}, 'TA': {"currency": "wadd","value": 0}, 'PA': {"currency": "wadd","value": 0},'age': 17 }
]

Tests:

Native findIndex
users[users.findIndex(u => u.user === 'jessika')]
_.find elem
_.find(users, u => u.user === 'jessika')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Native findIndex
_.find elem

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 break down the provided JSON and explain what's being tested in the benchmark.

**Benchmark Overview**

The benchmark compares the performance of two methods: native `Array.prototype.findIndex` and `_find` from the Lodash library. The test case uses an array of objects (`users`) to find a specific user based on their username.

**Options Compared**

There are two options being compared:

1. **Native `Array.prototype.findIndex`**: This method finds the index of the first element in the array that satisfies the provided condition (in this case, `u.user === 'jessika'`). If no element matches, it returns `-1`.
2. **Lodash `_find`**: This method returns the value of the first element in the array that satisfies the provided condition.

**Pros and Cons**

* **Native `Array.prototype.findIndex`**:
	+ Pros: Generally faster than Lodash methods since it's implemented in native JavaScript.
	+ Cons: Can be slower for smaller arrays or arrays with a single element, as it may involve more computations to find the first matching element.
* **Lodash `_find`**:
	+ Pros: Often more readable and maintainable code, especially for complex conditions. Also, Lodash provides additional features like support for multiple conditions.
	+ Cons: Can be slower than native methods due to overhead from the library.

**Library Used**

The benchmark uses Lodash (version 4.17.5), a popular JavaScript utility library that provides various functions for tasks like array manipulation, string manipulation, and more.

**Special JS Feature or Syntax**

There is no special JS feature or syntax being used in this benchmark beyond what's standard in modern JavaScript. However, it's worth noting that some older browsers might not support certain features of Lodash.

**Other Alternatives**

If you want to implement your own custom `findIndex`-like function without using Lodash, you can use a simple loop or recursion. For example:

```javascript
function customFindIndex(arr, predicate) {
  for (let i = 0; i < arr.length; i++) {
    if (predicate(arr[i])) return i;
  }
  return -1;
}
```

This implementation is generally slower than the native `Array.prototype.findIndex` method but can be useful for educational or specific use cases.

In summary, this benchmark helps compare the performance of two methods: native JavaScript's `Array.prototype.findIndex` and Lodash's `_find`. The choice between these options depends on your specific requirements, such as code readability, performance needs, and personal preference.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Windows

View result in a separate tab

Test name	Executions per second
Native findIndex	8306728.5 Ops/sec
_.find elem	3058380.5 Ops/sec

Related benchmarks:

native findIndex vs lodash find element (version: 0)

Compare performance of native [].findIndex and _.find

Comparing performance of: Native findIndex vs _.find elem

Created: one year ago by: Guest

Jump to the latest result

Native findIndex

_.find elem

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):