Benchmark: sorting an array and then reverse vs sorting with reversive comparison

Tests:

sorting an array and then reverse
const arr = [ 83, 52, 100, 58, 20, 41, 53, 19, 27, 60, 91, 2, 29, 78, 45, 49, 56, 98, 35, 66, 63, 79, 3, 61, 75, 59, 71, 65, 34, 1, 81, 74, 30, 5, 97, 57, 62, 31, 92, 43, 16, 55, 32, 8, 46, 68, 40, 12, 87, 82, 80, 54, 96, 14, 94, 88, 72, 67, 24, 85, 76, 15, 18, 17, 64, 11, 51, 25, 38, 21, 48, 28, 39, 7, 89, 33, 26, 73, 90, 95, 36, 10, 47, 6, 69, 22, 4, 86, 44, 9, 93, 37, 84, 42, 99, 23, 77, 13, 70, 50]; const case1 = [...arr].sort( (a,b) => a - b).reverse();
sorting with reversive comparison
const arr = [ 83, 52, 100, 58, 20, 41, 53, 19, 27, 60, 91, 2, 29, 78, 45, 49, 56, 98, 35, 66, 63, 79, 3, 61, 75, 59, 71, 65, 34, 1, 81, 74, 30, 5, 97, 57, 62, 31, 92, 43, 16, 55, 32, 8, 46, 68, 40, 12, 87, 82, 80, 54, 96, 14, 94, 88, 72, 67, 24, 85, 76, 15, 18, 17, 64, 11, 51, 25, 38, 21, 48, 28, 39, 7, 89, 33, 26, 73, 90, 95, 36, 10, 47, 6, 69, 22, 4, 86, 44, 9, 93, 37, 84, 42, 99, 23, 77, 13, 70, 50]; const case2 = [...arr].sort( (a,b) => b - a);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
sorting an array and then reverse
sorting with reversive comparison

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
sorting an array and then reverse	290203.2 Ops/sec
sorting with reversive comparison	305000.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark test cases.

**Benchmark Definition**

The benchmark is designed to compare two approaches for sorting an array and then reversing it. The goal is to determine which approach is faster.

**Options Compared**

There are two options being compared:

1. **Sorting an array and then reversing it**: This approach sorts the array in ascending order and then reverses the sorted array using the `reverse()` method.
2. **Sorting with reverse comparison**: This approach uses a custom comparison function that returns the negative of the difference between two elements, effectively sorting the array in descending order.

**Pros and Cons**

**Approach 1: Sorting an array and then reversing it**

Pros:

* Easy to understand and implement
* Works well for small arrays

Cons:

* Has to sort the entire array first, which can be time-consuming
* Reversing the sorted array can also be slow

**Approach 2: Sorting with reverse comparison**

Pros:

* Can take advantage of the CPU's natural sorting algorithm, making it potentially faster
* May be more efficient for large arrays

Cons:

* Requires a custom comparison function, which can add complexity
* May not work well for certain types of data or edge cases

**Library/Functionality Used**

In both test cases, the `sort()` and `reverse()` methods are used from the JavaScript Array prototype. These methods are built-in to most modern browsers and provide efficient sorting algorithms.

**Special JS Feature/Syntax**

None mentioned in this specific benchmark. However, note that custom comparison functions like `(a,b) => b - a` are used for the reverse comparison approach.

**Other Alternatives**

There are other approaches to sorting arrays, such as:

* Using `Array.prototype.sort()` with a different comparison function (e.g., `(a,b) => a - b` for ascending order)
* Using external libraries like Lodash or Ramda for sorting
* Implementing custom sorting algorithms (e.g., quicksort, mergesort)

In general, the choice of sorting algorithm depends on the specific use case and requirements. For most cases, built-in methods like `Array.prototype.sort()` are sufficient and efficient.

Related benchmarks:

sorting an array and then reverse vs sorting with reversive comparison (version: 0)

Comparing performance of: sorting an array and then reverse vs sorting with reversive comparison

Created: 2 years ago by: Guest

Jump to the latest result

sorting an array and then reverse

sorting with reversive comparison

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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