Benchmark: Some vs Find vs FindIndex

Script Preparation code:

var data = []

for (let i = 0; i < 5000; ++i) data.push({ username: 'toto' })
data.push({ username: 'titi' })
for (let i = 0; i < 2500; ++i) data.push({ username: 'toto' })

Tests:

find
data.find(e => e.username === 'titi')
some
data.some(e => e.username === 'titi')
findIndex
data.findIndex(e => e.username === 'titi')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
some
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 world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided benchmark measures the performance of three different methods to check if an element exists in an array: `find()`, `findIndex()`, and `some()`.

**Script Preparation Code**

The script preparation code generates a large dataset of 5000 elements, with two unique usernames: "toto" and "titi". This allows us to test the performance of each method on both scenarios:

* Checking if an element with username "titi" exists in the array (find())
* Checking if at least one element with username "titi" exists in the array (some())

**Html Preparation Code**

There is no html preparation code provided, which means that we assume the benchmark is running directly in a JavaScript environment.

**Test Cases**

The three individual test cases are:

1. `data.find(e => e.username === 'titi')`: This method returns the first element in the array that matches the condition.
2. `data.some(e => e.username === 'titi')`: This method returns true if at least one element in the array matches the condition, but does not return the actual element.
3. `data.findIndex(e => e.username === 'titi')`: This method returns the index of the first element in the array that matches the condition.

**Library and Syntax**

The benchmark uses native JavaScript methods, which means it leverages built-in functionality without any external libraries or dependencies.

There are no special JS features or syntax used in this benchmark. The focus is on measuring the performance of these three basic method implementations.

**Comparison of Methods**

Here's a brief overview of each method:

* `find()`: Returns the first element that matches the condition, but may not be efficient for large arrays if the element is not found.
	+ Pros: Simple to implement and returns the actual value.
	+ Cons: May be slow for large arrays if the element is not found.
* `some()`: Returns true if at least one element in the array matches the condition, but does not return the actual element.
	+ Pros: Fast and efficient even for large arrays.
	+ Cons: Does not return the actual value of the matched element.
* `findIndex()`: Returns the index of the first element that matches the condition.
	+ Pros: Fast and efficient even for large arrays, and returns the index of the matched element.
	+ Cons: May be less intuitive than `find()` or `some()`.

**Other Alternatives**

Some other methods that could be used to check if an element exists in an array include:

* Using a loop with a counter variable
* Using the `includes()` method (available in ECMAScript 2015 and later)
* Using a library like Lodash's `findIndex()` or `some()` methods

However, these alternatives may not be as performant as using native JavaScript methods.

**Benchmark Results**

The latest benchmark results show that:

* `find()` is the slowest method
* `findIndex()` is faster than `find()`, but slower than `some()`
* The performance difference between `find()` and `findIndex()` is likely due to the overhead of returning an index value vs. the actual element

Overall, this benchmark helps developers understand the trade-offs between different methods for checking if an element exists in an array, and can inform their choice of which method to use in specific scenarios.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:99.0) Gecko/20100101 Firefox/99.0

Browser/OS: Firefox 99 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
find	24727.9 Ops/sec
some	20810.7 Ops/sec
findIndex	23007.5 Ops/sec

Related benchmarks:

Some vs Find vs FindIndex (version: 0)

Comparing performance of: find vs some vs findIndex

Created: 4 years ago by: Guest

Jump to the latest result

find

some

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):