Benchmark: some vs findIndex (Array prototype methods)

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E8) arr[i] = i++;

Tests:

Array.prototype.some
const rt = arr.some(item => item === 1E7);
Array.prototype.findIndex
const rt = arr.findIndex(item => item === 1E7);

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: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.some	90.1 Ops/sec
Array.prototype.findIndex	153.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested, compared, and the pros/cons of different approaches.

**Benchmark Definition**

The benchmark definition represents a JavaScript function that performs some operation on an array. In this case, there are two functions:

1. `Array.prototype.some()`: This function returns `true` if at least one element in the array passes the test implemented by its `callback` parameter.
2. `Array.prototype.findIndex()`: This function returns the index of the first element in the array that passes the test implemented by its `callback` parameter.

**Options being compared**

The benchmark is comparing two approaches:

1. **Using `some()`**: This approach uses the `some()` method to iterate through the array and check for a condition.
2. **Using `findIndex()`**: This approach uses the `findIndex()` method to find the index of the first element that meets a certain condition.

**Pros and cons**

* **Using `some()`**:
	+ Pros: Generally faster, as it only needs to iterate through the array once and can stop early if the callback returns `false`.
	+ Cons: Returns `true` or `false`, depending on whether at least one element passes the test. If no elements pass, it returns `false`. This might not be suitable for all use cases.
* **Using `findIndex()`**:
	+ Pros: Returns the index of the first element that meets the condition, which can be useful in some scenarios.
	+ Cons: Returns `-1` if no elements meet the condition. It also has to iterate through the entire array.

**Library usage**

There is no explicit library mentioned in the benchmark definition or options being compared. However, both `some()` and `findIndex()` are built-in methods of the Array prototype.

**Special JS feature/syntax**

None mentioned.

Now, let's consider other alternatives:

* **Using a loop**: Instead of using `some()` or `findIndex()`, you could use a traditional loop to iterate through the array. This would likely be slower than both of the built-in methods.
* **Using `forEach()` with `break`**: You could use `forEach()` and break out of the loop as soon as the condition is met. This would have similar performance characteristics to using `some()`, but might not be as concise.

Keep in mind that the best approach depends on the specific use case and requirements of your application.

Related benchmarks:

some vs findIndex (Array prototype methods) (version: 0)

Measuring which is faster

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

Created: 7 months ago by: Guest

Jump to the latest result

Array.prototype.some

Array.prototype.findIndex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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