Benchmark: Swapping array elements, destructuring vs temporary variable

Tests:

Destructuring
let myArray = [12, -2, 55, 68, 80, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; const swapElementsDest = (array, index1, index2) => { [myArray[index1], myArray[index2]] = [myArray[index2], myArray[index1]]; }; for(let i = 0; i < myArray.length - 1; ++i){ swapElementsDest(myArray, i, i+1) }
Temporary Variable
let myArray = [12, -2, 55, 68, 80, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; const swapElementsTemp = (array, index1, index2) => { let temp = array[index1]; array[index1] = array[index2]; array[index2] = temp; }; for(let i = 0; i < myArray.length - 1; ++i){ swapElementsTemp(myArray, i, i+1) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Destructuring
Temporary Variable

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the Benchmark Definition and test cases.

**Benchmark Definition:**
The benchmark measures the performance of two approaches to swap elements in an array:

1. Destructuring (swapping without using a temporary variable)
2. Temporary Variable (using a temporary variable to hold one of the values before swapping)

**Options Compared:**

* **Destructuring**: This approach uses JavaScript's syntax feature called destructuring assignment, which allows assigning values from one object or array to another in a single statement.
	+ Pros:
		- More concise and readable code
		- Less memory usage since no temporary variable is created
	+ Cons:
		- May be slower due to the overhead of parsing the syntax
		- Not all browsers support this feature, although it's widely supported in modern versions of Chrome
* **Temporary Variable**: This approach uses a traditional assignment pattern, where a temporary variable is declared and assigned one of the values before swapping them.
	+ Pros:
		- More widely supported across browsers
		- Generally faster since no syntax parsing overhead is involved
	+ Cons:
		- Less concise code
		- Creates an additional memory allocation for the temporary variable

**Library:**
There are no libraries used in this benchmark.

**Special JS Feature or Syntax:**
Yes, destructuring assignment is a special JavaScript feature and syntax. It was introduced in ECMAScript 2015 (ES6) as part of the new language features added to the standard.

**Benchmark Preparation Code and Individual Test Cases:**

The `Script Preparation Code` field is empty, which means that no script needs to be executed before running the benchmark. The `Html Preparation Code` field is also empty, indicating that no HTML code needs to be generated or modified before running the benchmark.

Each test case consists of a single benchmark definition with two different approaches (Destructuring and Temporary Variable) for swapping elements in an array. The test cases use a predefined array `myArray` and a simple loop to iterate through the array, swapping adjacent elements using the defined functions.

**Benchmark Results:**
The latest benchmark results show that:

* **Temporary Variable**: Chrome 118 on Desktop (Windows) achieves approximately 40582708 executions per second.
* **Destructuring**: Chrome 118 on Desktop (Windows) achieves approximately 21399104 executions per second, which is about 50% slower than the Temporary Variable approach.

Keep in mind that these results are likely influenced by various factors, including browser version, operating system, and hardware. It's essential to consider multiple test runs and browser versions when interpreting benchmarking results.

**Other Alternatives:**

In addition to the two approaches mentioned in the benchmark (Destructuring and Temporary Variable), other alternatives could include:

* **Array.prototype.sort()**: While not ideal for swapping adjacent elements, sorting the array using `sort()` can be an alternative approach. However, this method may have a higher overhead due to the need to sort the entire array.
* **Using a dedicated library or framework**: Depending on the specific use case and requirements, using a specialized library or framework (e.g., a JavaScript array manipulation library) might provide faster execution times.

Please note that these alternatives are not necessarily better or worse than the Destructuring and Temporary Variable approaches; they simply offer different trade-offs in terms of performance, readability, and maintainability.

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/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Windows

View result in a separate tab

Test name	Executions per second
Destructuring	21399104.0 Ops/sec
Temporary Variable	40582708.0 Ops/sec

Related benchmarks:

Swapping array elements, destructuring vs temporary variable (version: 0)

Comparing performance of: Destructuring vs Temporary Variable

Created: one year ago by: Registered User

Jump to the latest result

Destructuring

Temporary Variable

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):