Benchmark: Some vs Find vs IndexOf

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')
indexof
data.indexOf('titi')>-1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Find
Some
indexof

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 explanation of the provided benchmark.

**Benchmark Description**

The benchmark is designed to compare the performance of three different methods: `some()`, `find()`, and `indexOf()` on an array of 10,000 objects. The array is populated with two types of objects: one with a username of "toto" and another with a username of "titi". This allows us to test for both the presence and absence of specific elements in the array.

**Options Compared**

The benchmark compares three options:

1. `some()`: Returns `true` if at least one element in the array passes the provided test.
2. `find()`: Returns the first element in the array that passes the provided test, or `undefined` if no such element exists.
3. `indexOf()`: Returns the index of the first occurrence of the specified value in the array, or `-1` if not found.

**Pros and Cons**

Here's a brief summary of each method:

* **some()**: Pros - lightweight, easy to read, and suitable for simple checks. Cons - can return `true` without actually finding the element, which might lead to incorrect results. Additionally, it uses the "some" flag in the browser's inner workings, which is not explicitly used by JavaScript.
* **find()**: Pros - finds the first matching element, making it easier to use when you know exactly what you're looking for. Cons - returns `undefined` if no match is found, which might lead to null pointer exceptions in some cases. Also, it uses the "find" flag.
* **indexOf()**: Pros - provides an exact index of the first occurrence, making it suitable for certain use cases (e.g., array manipulation). Cons - uses a linear search algorithm, especially for large arrays, and can be slower than other methods.

**Library and Special JS Features**

There is no library mentioned in the benchmark, but we should note that `some()` and `find()` are built-in JavaScript methods. The only special feature used here is the "some" and "find" flags in the browser's inner workings, which are not explicitly exposed by JavaScript.

**Other Considerations**

When choosing between these methods, consider the following:

* If you need to check if at least one element matches a condition, use `some()`.
* If you need to find the first matching element, use `find()`.
* If you need an exact index of the first occurrence, use `indexOf()`.

**Alternatives**

Some alternatives to these methods include:

* For finding specific values in arrays: `Array.prototype.includes()`
* For creating custom array searches (not built-in): You can create your own implementation using loops or recursion.

In conclusion, this benchmark allows users to compare the performance of three fundamental JavaScript array operations. Understanding the strengths and weaknesses of each method will help developers make informed choices when writing code that manipulates arrays.

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 OPR/107.0.0.0

Browser/OS: Opera 107 on Windows

View result in a separate tab

Test name	Executions per second
Find	185007.7 Ops/sec
Some	171933.7 Ops/sec
indexof	218734.0 Ops/sec

Related benchmarks:

Some vs Find vs IndexOf (version: 0)

Comparing performance of: Find vs Some vs indexof

Created: 8 months ago by: Guest

Jump to the latest result

Find

Some

indexof

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):