Benchmark: some vs findIndex (Array prototype methods)-1e6-nest

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E6) arr[i] = {a:{a:1,b:2,c:{amount:i++}}};

Tests:

Array.prototype.some
const rt = arr.some(item => item.a.c.amount === 1E6-123);
Array.prototype.findIndex
const rt = arr.findIndex(item => item.a.c.amount === 1E6-123);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.some
Array.prototype.findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser/OS: Chrome 125 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.some	119.3 Ops/sec
Array.prototype.findIndex	117.1 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 JSON benchmark data and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition:**
The benchmark is measuring which method (some or findIndex) is faster when searching for an element in an array. The search condition checks if the amount property of a nested object matches a specific value.

**Script Preparation Code:**
A large array `arr` is created with 1,000,000 elements, where each element has a nested object with an "amount" property that increments from 0 to 1,000,000. This creates a scenario where the search operation needs to iterate over a large number of elements.

**Test Cases:**

### Array.prototype.some
The benchmark tests `Array.prototype.some`, which returns `true` if at least one element in the array satisfies the provided condition (in this case, `item.a.c.amount === 1E6-123`).

Pros:

* Efficient for cases where only a single element needs to be checked.
* Can short-circuit as soon as it finds a matching element.

Cons:

* May incur additional overhead when checking non-matching elements.
* Can lead to inaccurate results if the condition is not met on all elements due to floating-point precision issues.

### Array.prototype.findIndex
The benchmark tests `Array.prototype.findIndex`, which returns the index of the first element in the array that satisfies the provided condition (in this case, `item.a.c.amount === 1E6-123`).

Pros:

* More precise than some, as it returns an exact index or -1 if not found.
* Less prone to floating-point precision issues.

Cons:

* May require more CPU cycles to iterate over the entire array.

**Other Considerations:**

* **Performance**: The benchmark is designed to test performance, so it's essential to consider the trade-offs between speed and accuracy.
* **Browser/Device Variability**: The benchmark results show variations between different browsers (Chrome 125) and devices (Desktop), which highlights the importance of considering these factors in web development.

**Library/Functionality:**
None are explicitly mentioned, but `Array.prototype.some` and `Array.prototype.findIndex` are built-in JavaScript methods that don't rely on external libraries.

**Special JS Feature/Syntax:**
No special features or syntax are used in this benchmark. However, it's essential to note that using floating-point numbers (e.g., `1E6-123`) might lead to precision issues due to JavaScript's limitations with fractional literals.

**Alternatives:**

* **Array.prototype.every**: Another built-in method that can be used instead of some, but it will return false as soon as the first non-matching element is found.
* **forEach**, `map`, or other iteration methods might be used in alternative implementations to compare performance with these array methods.

Overall, this benchmark provides a straightforward comparison between two commonly used array methods in JavaScript, helping developers understand their performance characteristics and make informed decisions when choosing the right approach for specific use cases.

Related benchmarks:

some vs findIndex (Array prototype methods)-1e6-nest (version: 0)

Measuring which is faster

Comparing performance of: Array.prototype.some vs Array.prototype.findIndex

Created: one year ago by: Guest

Jump to the latest result

Array.prototype.some

Array.prototype.findIndex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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