Benchmark: Filter vs indexOf Speed a

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, 9999001);
remove finding element using filter
function removeElement(testArray, element) { return testArray.filter(s => s !== element); } removeElement(testArray, 9999001);

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 dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided JSON represents a benchmark test that compares the performance of two approaches to remove an element from an array in JavaScript: `indexOf` and `filter`.

**Script Preparation Code**

The script preparation code creates a large array `testArray` with 10,000 elements, where each element is a number between 1 and 100,000 (inclusive). This array is used as the input for both benchmarking functions.

**Benchmark Definition**

There are two benchmark definitions:

1. **Remove Element using IndexOf**: This function uses the `indexOf` method to find the index of the specified element in the array. If the element is found, it returns a new array with the element removed using the `splice` method.
2. **Remove Element using Filter**: This function uses the `filter` method to create a new array that excludes the specified element.

**Options Compared**

The benchmark compares two options:

* `indexOf`: This method scans through the entire array to find the index of the specified element, making it less efficient for large arrays.
* `filter`: This method creates a new array with elements that do not match the condition (in this case, excluding the specified element), making it more efficient for large arrays.

**Pros and Cons**

* **IndexOf**: Pros:
	+ Simple to implement
	+ Works well for small arrays
Cons:
	+ Inefficient for large arrays due to sequential scanning
	+ Creates a new array with multiple elements removed in each iteration, leading to unnecessary memory allocation and deallocation.
* **Filter**: Pros:
	+ Efficient for large arrays as it uses a more linear search algorithm
	+ Creates a new array with the desired element excluded, avoiding unnecessary memory allocations and deallocations.
Cons:
	+ May have higher overhead due to function call and array creation.

**Library and Purpose**

The `filter` method is a built-in JavaScript method that creates a new array with elements that pass a test. In this benchmark, it's used as the basis for removing an element from the array.

**Special JS Feature or Syntax**

There are no special features or syntaxes being tested in this benchmark. The focus is solely on comparing the performance of two basic array manipulation techniques: `indexOf` and `filter`.

**Other Alternatives**

Other alternatives to remove elements from an array could include:

* Using a `for` loop with a manual index
* Using the `map` method with a callback function that excludes the desired element
* Using a library like Lodash's `removeAt` function

However, in this benchmark, only two options are being compared: `indexOf` and `filter`.

I hope this explanation helps you understand what's happening in the MeasureThat.net benchmark!

Related benchmarks:

Filter vs indexOf Speed a (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: 4 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):