Benchmark: Some vs. Filter vs. Find vs. FindIndex

Script Preparation code:

var testElements = [];
for (var i = 0; i < 100000; i++) {
  testElements.push({value: Math.random() * 100});
}
testElements.push({value: 10000});

Tests:

Array.some
var tempResult = testElements.some(v => v.value === 10000);
Array.filter
var tempResult = testElements.filter(v => v.value === 10000);
Array.find
var tempResult = testElements.find(v => v.value === 10000);
Array.findIndex
var tempResult = testElements.findIndex(v => v.value === 10000);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.some
Array.filter
Array.find
Array.findIndex

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON.

The benchmark compares four different methods to find an element with a specific value (`10000`) within an array:

1. `Array.some()`: Returns `true` if at least one element of the array passes the test implemented by the provided function.
2. `Array.filter()`: Returns a new array containing all elements that pass the test implemented by the provided function.
3. `Array.find()`: Returns the first element that satisfies the providing function.
4. `Array.findIndex()`: Returns the index of the first element that satisfies the providing function.

These methods are often used to find specific values or patterns within an array, and their performance can vary depending on the size of the array and the complexity of the condition being tested.

**Options compared:**

* Array.prototype.some()
* Array.prototype.filter()
* Array.prototype.find()
* Array.prototype.findIndex()

**Pros and Cons:**

1. **Array.some()**:
	* Pros: Can stop iterating as soon as it finds a match, which can be beneficial for large arrays.
	* Cons: Returns `true` or `false`, making it less suitable for situations where you need the actual value.
2. **Array.filter()**:
	* Pros: Returns an array with all matching elements, which can be useful if you need to use the results later.
	* Cons: Creates a new array and may be slower than other methods due to object creation overhead.
3. **Array.find()**:
	* Pros: Returns the actual value of the first match, making it suitable for situations where you need the result.
	* Cons: May not be as fast as some() or filter(), especially for large arrays.
4. **Array.findIndex()**:
	* Pros: Returns the index of the first match, which can be useful in certain scenarios.
	* Cons: May not be as widely supported as other methods.

**Library/Function usage:**

None of the methods mentioned above use any external libraries or functions beyond what is built into JavaScript. The `some()`, `filter()`, and `find()` methods are part of the Array prototype, while `findIndex()` is also an array method.

**Special JS features/syntax:**

There are no special JS features or syntax used in this benchmark that would require additional explanation beyond basic understanding of JavaScript's built-in methods and data structures.

**Other alternatives:**

If you need to find specific values within an array, you might also consider using other approaches like:

* Using `Array.prototype.reduce()` with a callback function.
* Using `Array.prototype.map()` followed by checking the resulting array for matches.
* Using a library like Lodash (which provides `pick` and `filterAt` functions) or other utility libraries that offer more advanced filtering capabilities.

However, these alternatives are typically overkill for simple use cases like this benchmark, which is designed to compare basic methods.

Related benchmarks:

Some vs. Filter vs. Find vs. FindIndex (version: 4)

Comparing performance of: Array.some vs Array.filter vs Array.find vs Array.findIndex

Created: 2 years ago by: Registered User

Jump to the latest result

Array.some

Array.filter

Array.find

Array.findIndex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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