Benchmark: JS sada test - MeasureThat.net

Tests:

filter
const items = [...Array(1000).keys()] const newItems = items.filter(idx => idx !== 555)
splice
const items = [...Array(1000).keys()] const removeIdx = items.findIndex( item => item === 555) items.splice(removeIdx, 1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
filter
splice

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON and explain what's being tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition is a simple script that creates an array of 1000 indices using `Array(1000).keys()`, which generates an array with numbers from 0 to 999. The purpose of this script is not explicitly stated, but it's likely used as a common starting point for testing performance differences between two specific methods: `filter()` and `splice()`.

**Individual Test Cases**

There are two test cases:

1. **Filter**: This test case uses the `filter()` method to remove an index (555) from the array.
2. **Splice**: This test case uses the `splice()` method to remove an index (555) from the array.

**Options Compared**

In this benchmark, the only option being compared is the performance of using `filter()` versus `splice()`. Both methods are used to remove a specific element from the array.

**Pros and Cons of Each Approach:**

1. **Filter()**:
	* Pros:
		+ More concise and readable code
		+ Less overhead in terms of memory allocation and copying
	* Cons:
		+ May have higher performance overhead due to the use of a predicate function (in this case, `idx => idx !== 555`)
2. **Splice()**:
	* Pros:
		+ More efficient in terms of performance, as it modifies the array in-place without creating a new copy
	* Cons:
		+ Less readable and more verbose code

**Other Considerations**

In addition to the above points, there are other factors that might affect the performance difference between `filter()` and `splice()`:

1. **Array size**: As the array size increases, `splice()` may become slower due to the overhead of modifying the array in-place.
2. **Browser optimizations**: Different browsers may optimize their internal arrays differently, which can impact performance.

**Library Usage**

There is no explicit library usage mentioned in the provided benchmark definition or test cases. However, it's worth noting that some browsers (e.g., Chrome) have built-in support for some array methods through the `Array.prototype` object, such as `filter()` and `splice()`. These methods are not libraries per se but rather part of the browser's standard library.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in the provided benchmark definition or test cases.

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/110.0.0.0 Safari/537.36

Browser/OS: Chrome 110 on Windows

View result in a separate tab

Test name	Executions per second
filter	11979.8 Ops/sec
splice	14235.5 Ops/sec

Related benchmarks:

JS sada test (version: 0)

Comparing performance of: filter vs splice

Created: one year ago by: Guest

Jump to the latest result

filter

splice

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):