Benchmark: Filter vs indexOf Speed small sized array 7899432423fdsffds

Script Preparation code:


var testArray = [];
for (var i = 0; i <40; i++) {
  testArray.push(i)
}

Tests:

remove finding element using indexof
function removeElement(testArray, element) { return ( index = testArray.indexOf(element) !==-1) ? testArray.splice(index, 1):0; } removeElement(testArray, 39);
remove finding element using filter
function removeElement(testArray, element) { return testArray.filter(s => s !== element); } removeElement(testArray, 39);

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

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is tested, compared options, pros and cons of those approaches, and other considerations.

**Benchmark Overview**

The test case measures the performance difference between two approaches to remove an element from an array:

1. Using `indexOf` method with array indexing.
2. Using `filter()` function to create a new array without the specified element.

**Script Preparation Code**

The script preparation code creates an array of 40 elements and assigns it to the `testArray` variable:
```javascript
var testArray = [];
for (var i = 0; i <40; i++) {
  testArray.push(i);
}
```
This setup is used as a common base for both benchmark tests.

**Benchmark Definition**

The Benchmark Definition json contains two individual test cases:

1. **remove finding element using indexof**: This test case uses the `indexOf` method to find and remove an element from the array.
```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()` function to create a new array without the specified element.
```javascript
function removeElement(testArray, element) {
  return testArray.filter(s => s !== element);
}
```
**Library and Features**

In both tests, no external libraries are used. However, it's worth noting that modern JavaScript environments (like Node.js or browser engines) may have built-in optimizations for these methods.

**Performance Comparison**

The benchmark compares the execution speed of these two approaches:

1. **indexOf method**: This approach uses indexing to remove an element from the array.
2. **filter() function**: This approach creates a new array without the specified element, leaving the original array intact.

**Pros and Cons**

**IndexOf Method:**

Pros:

* Simple and straightforward implementation
* Fast execution time

Cons:

* Requires additional steps (index lookup) to remove an element
* May be slower for large arrays due to indexing overhead

**Filter() Function:**

Pros:

* Efficient way to create a new array without modifying the original one
* Flexible usage, as you can apply multiple filters

Cons:

* Creates a new array, which may lead to memory allocation and deallocation overhead
* Can be slower for small arrays or when filtering out single elements

**Other Considerations**

* Both approaches have a time complexity of O(n) in the worst case (linear search).
* The `indexOf` method has additional steps (index lookup) that may slow it down, while the `filter()` function is typically faster.
* For large arrays, the `filter()` function might be more efficient due to its ability to create a new array without modifying the original one.

**Alternatives**

Other approaches to remove an element from an array include:

1. **Array.prototype.map()**: While not suitable for removing elements, it can be used in combination with other methods (e.g., `map()` + `filter()`) or by using a custom implementation.
2. **Slice() method**: Similar to `indexOf`, this approach uses slicing the array to remove an element. However, it's generally faster and more efficient than indexing.

Keep in mind that performance optimization should be based on specific use cases and requirements. In some situations, readability and maintainability might take precedence over raw speed.

Latest run results:

Run details: (Test run date: 8 months 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	9563075.0 Ops/sec
remove finding element using filter	23586458.0 Ops/sec

Related benchmarks:

Filter vs indexOf Speed small sized array 7899432423fdsffds (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: 8 months ago by: Guest

Jump to the latest result

remove finding element using indexof

remove finding element using filter

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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