Benchmark: Some vs. Filter vs. findIndex - 1

Script Preparation code:

var hasZero = [];
var withoutZero = [];
for (var i = 0; i < 10000; i++) {
  hasZero.push(Math.floor(Math.random() * 1000));
  withoutZero.push(Math.floor(Math.random() * 1000) + 1)
}
var numToSearch = Math.round(Math.random());

Tests:

Array.some
var tempResult = !!numToSearch ? hasZero.some(v => v === 0) : withoutZero.some(v => v === 0);
Array.filter
var tempResult = !!numToSearch ? hasZero.filter(v => v === 0) : withoutZero.filter(v => v === 0);
Array.findIndex
var tempResult = !!numToSearch ? hasZero.findIndex(v => v === 0) : withoutZero.findIndex(v => v === 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's dive into the details of this benchmark.

**What is being tested?**

This benchmark compares three different ways to search for an element in an array:

1. `Array.some()`: This method returns `true` if at least one element in the array satisfies the provided testing function (in this case, finding a value equal to 0). If no elements satisfy the condition, it returns `false`.
2. `Array.filter()`: This method creates a new array with all elements that pass the test implemented by a provided function (again, finding a value equal to 0). If no elements satisfy the condition, an empty array is returned.
3. `Array.findIndex()`: This method returns the index of the first element in the array that satisfies the testing function (finding a value equal to 0). If no such element exists, it returns -1.

**Options being compared:**

* Using `some()` with a callback function (`v => v === 0`)
* Using `filter()` with a callback function (`v => v === 0`)
* Using `findIndex()` with a callback function (`v => v === 0`)

**Pros and cons of each approach:**

1. **Array.some()**:
	* Pros:
		+ Returns `true` as soon as the first matching element is found.
		+ More concise code compared to using `filter()` or `findIndex()`.
	* Cons:
		- Can be slower than `filter()` or `findIndex()` since it returns a boolean value instead of an index or a new array.
2. **Array.filter()**:
	* Pros:
		+ Returns all matching elements (if any) in addition to indicating whether at least one element matches.
		+ Can be useful if you need the actual values, not just an index or boolean flag.
	* Cons:
		- Creates a new array with potentially many elements, which can be memory-intensive for large datasets.
3. **Array.findIndex()**:
	* Pros:
		+ Returns the exact index of the first matching element (or -1 if no match).
		+ Can be faster than `some()` or `filter()` since it returns an index directly.
	* Cons:
		- Returns only the index of the first matching element, not all matching elements.

**Library and purpose:**

No external libraries are used in this benchmark. The JavaScript built-in methods (`Array.some()`, `Array.filter()`, and `Array.findIndex()`) are being compared.

**Special JS features or syntax:**

The benchmark uses arrow functions (e.g., `v => v === 0`), which are a concise way to define small, single-expression functions. This feature is not specific to this test case but is generally useful for simplifying code.

**Other alternatives:**

For searching an array, you can also consider using:

1. **Array.includes()**: Returns `true` if the array contains at least one element with a specified value (e.g., `hasZero.includes(0)`). This method is more suitable when searching for a single specific value.
2. **Looping through the array manually**: You can use a simple `for` loop or a `while` loop to search for an element in an array. However, this approach tends to be less efficient and less readable than using built-in methods.

Overall, the choice of method depends on your specific requirements:

* If you need to find the first matching element's index, use `findIndex()`.
* For searching multiple elements or returning a boolean value, consider using `some()` or `filter()`.

Related benchmarks:

Some vs. Filter vs. findIndex - 1 (version: 0)

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

Created: 3 years ago by: Guest

Jump to the latest result

Array.some

Array.filter

Array.findIndex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):