Benchmark: Some vs. Filter vs. indexOf

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)
}

Tests:

Array.some
var tempResult = !!Math.round(Math.random()) ? hasZero.some(v => v === 0) : withoutZero.some(v => v === 0);
Array.filter
var tempResult = !!Math.round(Math.random()) ? hasZero.filter(v => v === 0) : withoutZero.filter(v => v === 0);
Array.indexOf
var tempResult = !!Math.round(Math.random()) ? hasZero.indexOf(0) > -1 : withoutZero.indexOf(0) > -1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0

Browser/OS: Firefox 152 on Linux

View result in a separate tab

Test name	Executions per second
Array.some	38465.6 Ops/sec
Array.filter	20005.6 Ops/sec
Array.indexOf	280055.7 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 data for the JavaScript microbenchmark.

**What is tested:**

The benchmark compares three different approaches to filter an array of numbers with zeros:

1. `Array.some()`: Returns true if at least one element in the array satisfies the condition (in this case, `v === 0`).
2. `Array.filter()`: Returns a new array with only the elements that satisfy the condition (in this case, `v === 0`).
3. `Array.indexOf()`: Returns the index of the first occurrence of the specified value (in this case, `0`). If the value is not found, it returns -1.

**Options compared:**

The benchmark compares three different approaches:

* `some()` vs. `filter()`: Both methods are used to check for the presence of zeros in the array.
* `indexOf()` vs. `some()` and `filter()`: `indexOf()` is a more specialized method that finds the index of a specific value, whereas `some()` and `filter()` provide a more general way to check for elements.

**Pros and Cons:**

1. **Array.some():**
	* Pros:
		+ Simple and concise syntax.
		+ Can be used as a shorthand for more complex logic.
	* Cons:
		+ May be slower than `filter()` because it has to iterate over the entire array until it finds a match.
		+ Returns true if at least one element is found, which may not be what the developer intended.
2. **Array.filter():**
	* Pros:
		+ More explicit and flexible syntax than `some()`.
		+ Returns a new array with only the elements that satisfy the condition.
	* Cons:
		+ May require more code to achieve the desired result.
3. **Array.indexOf():**
	* Pros:
		+ Fastest of the three methods, as it uses an optimized algorithm to find the index of the value.
	* Cons:
		+ More specialized and less flexible than `some()` and `filter()`.
		+ Returns -1 if the value is not found, which may require additional handling.

**Library usage:**

None of the test cases use any external libraries. The benchmark only relies on built-in JavaScript methods.

**Special JS features or syntax:**

The benchmark uses a few features that are specific to JavaScript:

* `var` keyword for variable declarations.
* `some()` and `filter()` methods, which are part of the ECMAScript standard.
* `Math.round()` function, which rounds a number to the nearest integer.

Other alternatives:

For filtering arrays with zeros, you can also use other approaches such as:

* Using the `every()` method in combination with `!`
* Using the `includes()` method (available in modern browsers)
* Implementing your own custom filter function using a loop or recursion

Keep in mind that the performance difference between these alternatives may be negligible for small arrays, but can add up for larger datasets.

Related benchmarks:

Some vs. Filter vs. indexOf (version: 0)

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

Created: 8 years ago by: Guest

Jump to the latest result

Array.some

Array.filter

Array.indexOf

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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