Benchmark: array find vs some vs findIndex

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Tests:

array find
var a = ['hello', 'a', 'bc']; var b = a.find(item => item === 'bc');
array some
var a = ['hello', 'a', 'bc']; var b = a.some(item => item === 'bc');
array findIndex
var a = ['hello', 'a', 'bc']; var b = a.findIndex(item => item === 'bc');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array find
array some
array 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/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Windows

View result in a separate tab

Test name	Executions per second
array find	167438176.0 Ops/sec
array some	169823712.0 Ops/sec
array findIndex	164517600.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript array methods is crucial for understanding how these methods impact application performance. Let's break down the provided benchmark and explain what each option being compared does.

**Options being compared:**

1. `array.find()`: This method returns the first element in an array that satisfies the provided testing function.
2. `array.some()`: This method returns `true` if at least one element in an array satisfies the provided testing function, otherwise it returns `false`.
3. `array.findIndex()`: This method returns the index of the first element in an array that satisfies the provided testing function.

**Pros and Cons:**

*   **Performance:** `array.find()` is generally faster than `array.some()` because it only iterates over elements until it finds a match, whereas `array.some()` iterates over all elements regardless of whether any of them are matches.
*   **Control flow**: `array.find()` is more suitable when you want to get the result or return from an array with specific condition, whereas `array.some()` returns boolean value that can be used further in the code for conditional decision-making. On the other hand,  `array.findIndex()` provides its result as an index which might not always make sense and also might result in negative number if element is found at start of array.
*   **Handling results:** `array.find()` returns a single value; hence, handling cases where no match is found can be tricky. On the other hand, both `array.some()` and `array.findIndex()` return boolean values that allow better error handling.

**Library:**

The provided HTML preparation code includes a reference to Lodash's core module (`lodash.core.js`). This library provides various utility functions for tasks like testing, iteration, and more. In this specific case, it's used to provide the callback function passed to `array.find()`, `array.some()`, and `array.findIndex()`.

**Special JavaScript feature or syntax:**

There is no special JavaScript feature or syntax being tested in this benchmark.

Other alternatives for measuring array methods performance:

1.  **Array.prototype.filter()**: This method creates a new array with all elements that satisfy the provided testing function.
2.  **Array.prototype.forEach() / Array.prototype.forEachWithCallback()**: While not exactly optimized for finding single-element matches, these methods can be used to measure performance of similar algorithms that involve searching and returning values.

In conclusion, measuring JavaScript array methods' performance involves comparing different approaches such as `array.find()`, `array.some()`, and `array.findIndex()` based on factors like control flow, results handling, and general applicability in specific code scenarios.

Related benchmarks:

array find vs some vs findIndex (version: 0)

Comparing performance of: array find vs array some vs array findIndex

Created: 2 years ago by: Guest

Jump to the latest result

array find

array some

array findIndex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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