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

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E6) arr[i] = i++;

Tests:

Array.prototype.some
const rt = arr.some(item => item === 1E6-123);
Array.prototype.findIndex
const rt = arr.findIndex(item => item === 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: 7 months 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	161.5 Ops/sec
Array.prototype.findIndex	160.0 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 data to understand what is being tested.

**Benchmark Definition**

The benchmark defines two test cases:

1. `some` method: This method returns `true` if at least one element in the array satisfies the condition, or `false` if no elements satisfy it.
2. `findIndex` method: This method returns the index of the first element that satisfies the condition, or -1 if no elements satisfy it.

**Script Preparation Code**

The script preparation code generates an array `arr` with 1 million elements, starting from 0 and incrementing by 1 for each element.

```javascript
var arr = [];
var i = 0;
while (i <= 1E6) {
    arr[i] = i++;
}
```

This code creates a large array that can be used to test the performance of the `some` and `findIndex` methods.

**Comparison**

The benchmark compares the execution time of these two methods:

* `Array.prototype.some`
* `Array.prototype.findIndex`

**Options Compared**

Two main options are compared:

1. **Using `some` method**: This approach returns a boolean value indicating whether at least one element satisfies the condition.
2. **Using `findIndex` method**: This approach returns the index of the first element that satisfies the condition, or -1 if no elements satisfy it.

**Pros and Cons**

Here are some pros and cons of each approach:

* Using `some` method:
	+ Pros: Simple to implement, easy to read.
	+ Cons: Returns a boolean value, which may not be necessary for all use cases. May be slower than `findIndex` if the condition is computationally expensive.
* Using `findIndex` method:
	+ Pros: Returns an index, which can be useful in some scenarios. Can be faster than `some` if the condition is computationally expensive.
	+ Cons: Returns an index, not a boolean value. May require additional processing to handle cases where no elements satisfy the condition.

**Library**

The benchmark uses the Array prototype methods, specifically `Array.prototype.some()` and `Array.prototype.findIndex()`. These methods are built-in JavaScript methods that allow you to perform common array operations.

* `Array.prototype.some()`: Returns a boolean value indicating whether at least one element in the array satisfies the provided callback function.
* `Array.prototype.findIndex()`: Returns the index of the first element in the array that satisfies the provided callback function, or -1 if no elements satisfy it.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark. The code uses standard JavaScript syntax and built-in methods.

**Other Alternatives**

If you need to measure the performance of other array operations, you can consider using the following alternatives:

* `Array.prototype.includes()`: Returns a boolean value indicating whether an element with the specified value exists in the array.
* `Array.prototype.indexOf()`: Returns the index of the first element that satisfies the provided callback function, or -1 if no elements satisfy it.
* `Array.prototype.lastIndexOf()`: Returns the index of the last element that satisfies the provided callback function, or -1 if no elements satisfy it.

Keep in mind that these methods may have different performance characteristics than `some` and `findIndex`, so you should test them separately to determine which one is best for your use case.

Related benchmarks:

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