Benchmark: findindex vs some 2

Tests:

some
const userEmails = [ { email: 'teste@teste.com' }, { email: 'teste2@teste.com', type: 'personal' }, { email: 'teste3@teste.com' } ] userEmails.some(el => el.type === 'personal')
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:

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided benchmark is designed to compare two approaches: `some()` and `indexOf()`. These methods are used to find the index of a specific element in an array.

**Approach 1: Using `some()`**

`some()` is a method that returns `true` if at least one element in the array satisfies the provided condition. In this case, the condition is `el.type === 'personal'`.

The pros of using `some()` are:

* It's more concise and easier to read.
* It's often faster than `indexOf()`, especially for large arrays.

However, there are some cons:

* `some()` can be slower than `indexOf()` if the condition requires iterating over the entire array.
* The result is a boolean value (`true` or `false`), which might not be what you expect if you're used to indexing methods returning integers.

**Approach 2: Using `indexOf()`**

`indexOf()` returns the index of the first occurrence of the specified element in the array. In this case, the condition is `i.type === "personal"`.

The pros of using `indexOf()` are:

* It's generally faster than `some()`, especially for large arrays.
* The result is an integer value (or `-1` if not found), which might be what you expect.

However, there are some cons:

* The method requires checking the entire array, even if only one element matches the condition.
* If the array has a large number of elements, `indexOf()` can be slower than `some()` due to its more complex implementation.

**Other considerations**

Both methods have additional complexities:

* In JavaScript, using `in` operator instead of `===` for comparison might be faster (about 2-5% speed gain).
* Using a library like `lodash` or `ramda` can provide more concise and expressive ways to solve this problem.
* Caching the result of `indexOf()` on the first execution can improve performance, especially in scenarios where the array doesn't change frequently.

**Library usage**

There's no explicit mention of any libraries in the benchmark definition. However, if a library like `lodash` or `ramda` was used to implement one of these approaches, it would likely provide additional optimizations and abstractions, making the code more readable and efficient.

Now, let's talk about special JavaScript features:

In this case, there are no notable special features being used that require specific syntax handling. The benchmark is straightforward and focuses on comparing two methods.

The latest benchmark results show that Chrome 80, running on a desktop with Mac OS X 10.15.3, executed `some()` at approximately 391 million times per second, while `indexOf()` was around 379 million times per second.

Related benchmarks:

findindex vs some 2 (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

No previous run results

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