Benchmark: Filter vs indexOf

Script Preparation code:


var testArray = [];
for (var i = 0; i < 10000; i++) {
  testArray.push(Math.floor(i * 1000) + 1)
}

Tests:

remove finding element using indexof
function removeElement(testArray, element) { return ( index = testArray.indexOf(element) !==-1) ? testArray.splice(index, 1):0; } removeElement(testArray, 2000000);
remove finding element using filter
function removeElement(testArray, element) { return testArray.filter(s => s !== element); } removeElement(testArray, 2000000);

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:

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

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Let's break down the provided JSON and explain what's being tested, compared, and some pros/cons of each approach.

**Benchmark Overview**

The benchmark measures the performance of two approaches to remove an element from an array in JavaScript: using `indexOf` and using `filter`.

**Script Preparation Code**

The script preparation code creates a large test array with 10,000 elements, where each element is a number between 1 and 100,000. This is done to create a substantial dataset for the benchmark.

**Html Preparation Code**

There is no HTML preparation code provided, which means that the benchmark only runs in the JavaScript environment and doesn't involve any UI-related operations.

**Individual Test Cases**

There are two test cases:

1. **"remove finding element using indexof"**: This test case uses the `indexOf` method to find the index of a specified element (2000000) in the test array. If found, it removes the element at that index using `splice`. The function signature is:
```javascript
function removeElement(testArray, element) {
  return (index = testArray.indexOf(element) !==-1) ? testArray.splice(index, 1):0;
}
```
2. **"remove finding element using filter"**: This test case uses the `filter` method to create a new array that excludes the specified element (2000000). The function signature is:
```javascript
function removeElement(testArray, element) {
  return testArray.filter(s => s !== element);
}
```
**Library Used**

In both test cases, no libraries are explicitly used. However, the `splice` method uses the `Array.prototype.splice()` method, which is a part of the JavaScript standard library.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax being tested here.

**Pros and Cons of Each Approach**

1. **indexOf approach**
	* Pros:
		+ Generally faster than `filter` for small arrays.
		+ Can be more efficient when removing elements from the middle of an array, as it only shifts elements after the found index.
	* Cons:
		+ May not be suitable for large arrays or datasets, as it requires scanning the entire array to find the element.
		+ Can be slower than `filter` for larger datasets due to the overhead of finding the index.
2. **Filter approach**
	* Pros:
		+ More efficient and scalable for large datasets, as it only creates a new array with filtered elements.
		+ Does not require scanning the entire array to find an element.
	* Cons:
		+ May be slower than `indexOf` for small arrays or datasets due to the overhead of creating a new array.

**Other Alternatives**

In addition to these two approaches, other methods can be used to remove elements from an array in JavaScript, such as:

1. Using `map()` with a callback function that returns `undefined` for the desired element.
2. Using `forEach()` with a callback function that removes the desired element.
3. Using `reduce()` with a callback function that accumulates the filtered elements.

However, these alternatives may have different performance characteristics and use cases compared to the `indexOf` and `filter` approaches.

Related benchmarks:

Filter vs indexOf (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: 5 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

No previous run results

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