Benchmark: Selective sorting with splice() & unshift() vs sort()

Script Preparation code:

var sample = [...Array(10000)].map((_,i) => i)

Tests:

splice() & unshift()
let arr = [...sample] arr.forEach((item, i) => { if(item % 3 == 0){ arr.splice(i, 1) arr.unshift(item) } })
sort()
let arr = [...sample] arr.sort((i) => (i % 3 == 0) ? -1 : 0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice() & unshift()
sort()

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; rv:109.0) Gecko/20100101 Firefox/116.0

Browser/OS: Firefox 116 on Windows

View result in a separate tab

Test name	Executions per second
splice() & unshift()	25.2 Ops/sec
sort()	933.8 Ops/sec

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 definition and test cases.

**Benchmark Definition**

The website MeasureThat.net uses a JSON object to define a benchmark, which includes:

* `Name`: A unique name for the benchmark (in this case, "Selective sorting with splice() & unshift() vs sort()")
* `Description`: An optional description of the benchmark
* `Script Preparation Code` and `Html Preparation Code`: These are code snippets that are executed before running the actual benchmark. In this case, they both prepare an array (`sample`) with 10,000 elements.

**Individual Test Cases**

There are two test cases defined:

1. **splice() & unshift()**
	* The benchmark definition is a JavaScript function that:
		+ Creates an array `arr` from the `sample` array
		+ Loops through each element in the array using `forEach`
		+ For each element, checks if it's divisible by 3 (using modulo `%`)
		+ If it is, removes the current element from its original position using `splice()`, and then adds it to the beginning of the array using `unshift()`
2. **sort()**
	* The benchmark definition is a JavaScript function that:
		+ Creates an array `arr` from the `sample` array
		+ Uses the `sort()` method with a custom comparison function to sort the array based on whether each element is divisible by 3

**Comparison of Approaches**

Both approaches aim to select elements from the original array and add them to the beginning of the new array. However, they differ in how they achieve this:

* **splice() & unshift()**: This approach modifies the original array while adding elements to its head. It's a more efficient way to insert elements at specific positions because it only involves updating pointers.
* **sort()**: This approach creates a new sorted array and copies elements from the original array into it, which can be less efficient than modifying the original array.

**Pros and Cons of Each Approach**

* **splice() & unshift()**:
	+ Pros: More efficient for inserting elements at specific positions
	+ Cons: May modify the original array (which could lead to unexpected behavior if not expected)
* **sort()**:
	+ Pros: Easier to understand and implement, as it uses a standard sorting algorithm
	+ Cons: Less efficient for inserting elements at specific positions

**Library Usage**

There doesn't seem to be any library usage in the benchmark definition.

**Special JS Feature or Syntax**

Neither of the test cases utilizes any special JavaScript features or syntax that would require additional explanation.

**Other Alternatives**

If you need to implement a similar sorting algorithm, other alternatives could include:

* Using a more efficient sorting algorithm like quicksort or mergesort
* Implementing insertion sort or bucket sort
* Using a data structure like a balanced binary search tree

Keep in mind that the choice of implementation will depend on the specific requirements and constraints of your use case.

I hope this explanation helps!

Related benchmarks:

Selective sorting with splice() & unshift() vs sort() (version: 0)

Comparing performance of: splice() & unshift() vs sort()

Created: one year ago by: Guest

Jump to the latest result

splice() & unshift()

sort()

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):