Benchmark: find vs findIndex get item

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

Tests:

Array.prototype.find
const item = arr.find(item => item == 1E5);
Array.prototype.findIndex
const item = arr[arr.findIndex(item => item == 1E5)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.find
Array.prototype.findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36 OPR/89.0.4447.64

Browser/OS: Opera 89 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.find	678.0 Ops/sec
Array.prototype.findIndex	586.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data to understand what's being tested in this JavaScript microbenchmark.

**What is being tested?**

The benchmark is designed to compare two approaches for finding an item in an array:

1. Using `Array.prototype.find()`
2. Using `Array.prototype.findIndex()` with indexing (`arr[arr.findIndex(...)]`)

The goal is to measure which approach is faster.

**Options compared:**

There are two options being compared:

1. **find()**: This method returns the first element in an array that satisfies the provided condition (in this case, finding the item equal to 100,000). It iterates through the array until it finds a match.
2. **findFirst using findIndex with indexing**: Instead of directly calling `find()`, this approach uses `Array.prototype.findIndex()` to locate the index of the desired element and then uses indexing (`arr[arr.findIndex(...)]`) to retrieve that element.

**Pros and Cons:**

1. **Find()**
	* Pros:
		+ More concise and readable code.
		+ Easier to understand for developers familiar with this method.
	* Cons:
		+ May be slower due to the extra iteration required to find the first matching element.
2. **FindIndex with indexing**
	* Pros:
		+ Can potentially be faster, as it only finds the index of the desired element and then uses that index to retrieve it.
	* Cons:
		+ More verbose code, making it less readable and easier to understand.
		+ Requires manual indexing, which can lead to errors if not done correctly.

**Other considerations:**

* The benchmarking framework allows users to compare different approaches to solving a specific problem. This helps identify the most efficient solutions for common use cases in JavaScript development.
* The provided code uses a simple array `arr` with 100,000 elements, which is sufficient to demonstrate the performance difference between these two methods.

**Library:**

None are explicitly mentioned in the provided JSON data.

**Special JS feature or syntax:**

There is no special JavaScript feature or syntax used in this benchmark. It only relies on standard JavaScript features and syntax.

Now that we've gone through the explanation, let's consider some other alternatives for finding an item in an array:

* **for...of loop**: An alternative to both `find()` and `findIndex()`. While it provides more flexibility, it may not be as concise or readable.
* **Array.prototype.some()**: Another method that returns a boolean indicating whether at least one element matches the condition. This can be used in conjunction with indexing for a faster approach.
* **Caching**: If you know the size of your array and the elements are static, caching the result of `find()` or `findIndex()` could potentially speed up subsequent searches.

Keep in mind that the performance differences between these methods will depend on the specific use case and data.

Related benchmarks:

find vs findIndex get item (version: 0)

Measuring which is faster

Comparing performance of: Array.prototype.find vs Array.prototype.findIndex

Created: 2 years ago by: Registered User

Jump to the latest result

Array.prototype.find

Array.prototype.findIndex

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):