Benchmark: findindex vs some

Tests:

some
const userEmails = [ { email: 'teste@teste.com' }, { email: 'teste2@teste.com', type: 'personal' }, { email: 'teste3@teste.com' } ] const find = el => el.type === 'personal' userEmails.some(find)
findindex
const userEmails = [ { email: 'teste@teste.com' }, { email: 'teste2@teste.com', type: 'personal' }, { email: 'teste3@teste.com' } ] userEmails.findIndex(i => i.type === "personal") > 0;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
some
findindex

Fastest: N/A

Slowest: N/A

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/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Windows

View result in a separate tab

Test name	Executions per second
some	74710768.0 Ops/sec
findindex	69353376.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark compares two approaches to find an element in an array: `some` and `findIndex`. Both methods are used to search for a specific condition (in this case, `type === 'personal'`) within the `userEmails` array.

**What is being tested?**

* The performance difference between using `some` and `findIndex` to find an element in an array.
* The effect of the callback function on the execution time.

**Options compared:**

1. **`some`**: This method returns `true` as soon as it finds a match, and continues iterating through the rest of the array if no match is found. It's a more lightweight approach but might not be suitable for arrays with a large number of elements.
2. **`findIndex`**: This method returns the index of the first element that matches the provided callback function. If no match is found, it returns -1.

**Pros and Cons:**

* `some`:
	+ Pros:
		- More lightweight and faster for small arrays or when only one match is expected.
		- Can be more suitable for lazy evaluation scenarios.
	+ Cons:
		- May not be suitable for large arrays or when multiple matches are expected, as it can lead to unnecessary iterations.
* `findIndex`:
	+ Pros:
		- More accurate and reliable, especially for large arrays or when multiple matches are expected.
		- Can be used with more complex conditions (e.g., equality checks).
	+ Cons:
		- Might be slower than `some` for small arrays or simple conditions.

**Library usage:**

None of the benchmark tests explicitly use a library. However, it's worth noting that both `some` and `findIndex` methods rely on the underlying array implementation, which is usually provided by the JavaScript engine (e.g., V8 in Chrome).

**Special JS feature or syntax:**

* The callback function in both test cases uses a concise syntax (`el => el.type === 'personal'`) that's available since ECMAScript 2015 (ES6). This syntax allows for more readable and compact code.
* No other special features or syntax are used in these benchmark tests.

**Alternatives:**

Other alternatives to `some` and `findIndex` include:

1. **`forEach`**: While not specifically designed for finding a single match, `forEach` can be used with a callback function to achieve similar results. However, it's generally slower than `some` or `findIndex`.
2. **`filter`**: Another array method that returns an array of elements that pass the test implemented by the provided function. While not suitable for finding a single match, `filter` can be used in combination with other methods to achieve similar results.
3. **Native `indexOf`/`lastIndexOf` methods**: For arrays, these methods return the index of the first or last element matching the specified value. However, they might not work as expected if the array is modified concurrently.

Keep in mind that the performance differences between these alternatives can be significant, and the choice ultimately depends on the specific use case and requirements.

Related benchmarks:

findindex vs some (version: 0)

Comparing performance of: some vs findindex

Created: 6 years ago by: Guest

Jump to the latest result

some

findindex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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