Benchmark: test slice with indexOf vs filter

Script Preparation code:

var test=Array.from({length: 100},()=>(Math.random()*100).toFixed(0))

Tests:

splice with indexOf
test.splice(test.indexOf(25))
filter
test = test.filter(v => v!== 25)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice with indexOf
filter

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Windows

View result in a separate tab

Test name	Executions per second
splice with indexOf	5596672.0 Ops/sec
filter	5609661.5 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark in question tests two different approaches for finding and removing an element with a specific value (in this case, 25) from an array.

**Script Preparation Code**

The script preparation code creates an array `test` with 100 random elements between 0 and 99. This code is executed before each test run to ensure consistency across all tests.
```javascript
var test = Array.from({length: 100}, () => (Math.random() * 100).toFixed(0));
```
**Html Preparation Code**

The html preparation code is null, which means no additional HTML is generated for these benchmarks.

**Individual Test Cases**

There are two individual test cases:

1. **splice with indexOf**
```javascript
test.splice(test.indexOf(25))
```
This test uses the `indexOf` method to find the index of the first occurrence of 25 in the array, and then uses the `splice` method to remove the element at that index.

2. **filter**
```javascript
test = test.filter(v => v !== 25)
```
This test uses the `filter` method with an arrow function to create a new array that includes only elements that are not equal to 25.

**Comparison**

The two tests are compared using the following metrics:

* **RawUAString**: The user agent string of the browser running the test.
* **Browser**: The version of Chrome being run.
* **DevicePlatform**: The device platform (Desktop or Mobile).
* **OperatingSystem**: The operating system (Windows).
* **ExecutionsPerSecond**: The number of executions per second.

**Pros and Cons**

Both approaches have their trade-offs:

1. **splice with indexOf**
	* Pros:
		+ Can be faster for small arrays, since it only requires a single pass through the array.
		+ Can be more efficient in terms of memory usage, since it doesn't create a new array.
	* Cons:
		+ Requires two iterations over the array: one to find the index and another to remove the element.
		+ Can be slower for larger arrays, since the `indexOf` method has to iterate through the entire array.
2. **filter**
	* Pros:
		+ Only requires a single pass through the array, making it potentially faster for large arrays.
		+ Creates a new array with the filtered elements, which can be more memory-efficient than modifying the original array.
	* Cons:
		+ Can be slower due to the creation of a new array.
		+ Requires additional memory allocation.

**Library and Special JS Feature**

There is no explicit library mentioned in the code. However, the `filter` method uses a feature called "arrow functions" (introduced in ECMAScript 2015), which is not explicitly mentioned in the JSON. Arrow functions provide a concise way to define small, single-expression functions.

**Other Alternatives**

Alternative approaches for finding and removing an element from an array include:

1. **map**: Creating a new array with elements that meet a certain condition.
2. **reduce**: Iterating through the array and accumulating elements that meet a certain condition.
3. **forEach**: Iterating through the array and executing a callback function on each element.

Each of these alternatives has its own trade-offs in terms of performance, memory usage, and conciseness.

Related benchmarks:

test slice with indexOf vs filter (version: 0)

test slice with indexOf vs filter

Comparing performance of: splice with indexOf vs filter

Created: one year ago by: Guest

Jump to the latest result

splice with indexOf

filter

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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