Benchmark: Filter vs indexOf Speed small sized array 4

Script Preparation code:


var testArray = [];
for (var i = 0; i < 100; i++) {
  testArray.push(Math.floor(i * 100) + 1)
}

Tests:

remove finding element using indexof
function removeElement(testArray, element) { return ( index = testArray.indexOf(element) !==-1) ? testArray.splice(index, 1):0; } removeElement(testArray, 99);
remove finding element using filter
function removeElement(testArray, element) { return testArray.filter(s => s !== element); } removeElement(testArray, 99);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
remove finding element using indexof
remove finding element using filter

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
remove finding element using indexof	8496023.0 Ops/sec
remove finding element using filter	4239782.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.

**What is being tested?**

The provided benchmark compares two approaches to remove an element from an array: using `indexOf` and using the `filter()` method. The test case uses a JavaScript function named `removeElement`, which takes two parameters: `testArray` and `element`.

**Options compared:**

There are two options being compared:

1. **Using `indexOf`**: This approach searches for the specified element in the array using the `indexOf` method, and if found, returns its index. The element is then removed from the array using the `splice()` method at that index.
2. **Using `filter()`**: This approach uses a callback function to create a new array with only the elements that do not match the specified element.

**Pros and cons of each approach:**

1. **Using `indexOf`**:
	* Pros:
		+ Can be faster for smaller arrays or when the element is known to exist in the array.
		+ May be more efficient for certain use cases, such as finding a specific element's index.
	* Cons:
		+ Can be slower for larger arrays or when the element does not exist in the array (results in -1).
		+ Requires additional operations to remove the element from the array.
2. **Using `filter()`**:
	* Pros:
		+ More concise and expressive, as it creates a new array with only the desired elements.
		+ Can be faster for larger arrays or when removing multiple elements (as it only requires one pass through the array).
	* Cons:
		+ May require more memory to create a new array, especially for large datasets.
		+ Can be less efficient if the filter function is complex or computationally expensive.

**Library and its purpose:**

In this benchmark, no external library is explicitly mentioned. However, it's likely that the `splice()` method used in the `indexOf` approach is part of the built-in JavaScript API.

**Special JS feature or syntax:**

There are a few subtle aspects to this benchmark:

* The use of `Math.floor(i * 100) + 1` creates an array with values from 1 to 999, which helps demonstrate the performance difference between the two approaches.
* The `for...of` loop (not explicitly mentioned, but implied by the `push()` method) is used to create a large array.

**Other alternatives:**

There are other ways to remove elements from an array in JavaScript:

* Using `forEach()` and `splice()`: `testArray.forEach((element) => { if (element === elementToRemove) { testArray.splice(testArray.indexOf(element), 1); } });`
* Using `map()` and `filter()`: `const newArray = testArray.map((element) => element !== elementToRemove ? element : null).filter((element) => element !== null);`

These alternatives may have different performance characteristics depending on the specific use case.

In conclusion, this benchmark provides a clear comparison between two approaches to remove an element from an array: using `indexOf` and using the `filter()` method. Understanding the pros and cons of each approach can help developers choose the most suitable solution for their specific use cases.

Related benchmarks:

Filter vs indexOf Speed small sized array 4 (version: 0)

Filter vs indexOf in array remove element Javascript

Comparing performance of: remove finding element using indexof vs remove finding element using filter

Created: 2 years ago by: Guest

Jump to the latest result

remove finding element using indexof

remove finding element using filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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