Benchmark: sort vs unshift - MeasureThat.net

Script Preparation code:

var arr = [...Array(10000)].map((_,i) => i % 2)

Tests:

sort
arr = arr.sort((a, b) => a == 0 ? 1 : -1)
unshift
arr = arr.reduce((acc, curr) => { if (curr == 0) { acc.push(curr); } else { acc.unshift(curr); } return acc; }, []);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
sort
unshift

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 120 on Android

View result in a separate tab

Test name	Executions per second
sort	3554.5 Ops/sec
unshift	350.1 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON and explain what's being tested, compared, and their pros/cons.

**Benchmark Definition**

The benchmark measures the performance difference between two approaches: sorting an array using the `sort()` method and shifting elements to the beginning of the array using the `unshift()` method. The benchmark is designed to test how fast these two operations are on a large array (10,000 elements).

**Script Preparation Code**

```javascript
var arr = [...Array(10000)].map((_, i) => i % 2);
```

This script generates an array of 10,000 random integers, where every other element is even (0). This will be used as the input for both sorting and unshifting operations.

**Html Preparation Code**

Since there's no HTML preparation code provided, we can assume that it's not a critical factor in this benchmark. If the test relies on specific DOM manipulation or rendering, then the browser's HTML rendering engine would come into play, but that's not the case here.

**Individual Test Cases**

There are two test cases:

1. **sort**: This test case uses the `sort()` method to sort the generated array in ascending order.
2. **unshift**: This test case uses the `reduce()` method (not shown in the code snippet) with a custom implementation to shift all even elements to the beginning of the array.

**Library Usage**

The benchmark uses the `Array.prototype.sort()` and `Array.prototype.unshift()` methods, which are part of the built-in JavaScript Array prototype. These methods are implemented by the browser's engine and are not specific to any third-party library.

**Special JS Feature or Syntax**

There doesn't seem to be any special JavaScript feature or syntax used in this benchmark. The test cases rely on standard JavaScript array operations and built-in methods.

**Pros and Cons of Approaches**

1. **Sort() Method:**
	* Pros:
		+ Can sort the entire array in a single pass.
		+ Reduces the number of elements that need to be compared.
	* Cons:
		+ Can be slower for large arrays due to the algorithm's overhead.
		+ Requires more memory access and cache misses.
2. **Unshift() Method:**
	* Pros:
		+ Does not require shuffling the entire array, reducing memory access and cache misses.
		+ Can be faster for large arrays due to reduced memory accesses.
	* Cons:
		+ Shifts all elements after the first one, which can be slower than sorting the entire array.

**Other Alternatives**

Some alternative approaches that could have been considered in this benchmark include:

1. **Splice() Method**: Instead of using `unshift()`, you could use `splice()` to remove all even elements from the beginning of the array and then add them back at the end.
2. **Using a third-party library**: Depending on the specific requirements, a third-party library like Lodash or Ramda could be used to implement a more efficient sorting algorithm.
3. **Parallelization**: If the benchmark is designed for multi-core CPUs, parallelizing the test cases using multiple threads could significantly improve performance.

Keep in mind that the choice of approach depends on the specific requirements and constraints of the project.

Related benchmarks:

sort vs unshift (version: 0)

sort vs unshift

Comparing performance of: sort vs unshift

Created: 2 years ago by: Guest

Jump to the latest result

sort

unshift

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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