Benchmark: reverse2 - MeasureThat.net

Tests:

temp swap
let arr = [1,4,6] let len = arr.length let temp = 0 for(let i=0; i<Math.floor(arr.length/2); i++){ let x = i let y = len-1-i temp = arr[x] arr[x] = arr[y] arr[y] = temp } console.log(arr)
xor swap
let arr = [1,4,6] let len = arr.length for(let i=0; i<Math.floor(arr.length/2); i++){ let x = i let y = len-1-i arr[x] = arr[x] ^ arr[y] arr[y] = arr[x] ^ arr[y] arr[x] = arr[x] ^ arr[y] } console.log(arr)
inbuilt
let arr= [1,2,3] arr.reverse() console.log(arr)
manual rvers
let arr=[1,2,3], res =[] for(let i=arr.length-1; i>=0; i--) { res = arr[i] } console.log(res)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
temp swap
xor swap
inbuilt
manual rvers

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.104 Safari/537.36

Browser/OS: Chrome 88 on Windows

View result in a separate tab

Test name	Executions per second
temp swap	24911.3 Ops/sec
xor swap	26692.7 Ops/sec
inbuilt	30481.9 Ops/sec
manual rvers	31322.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a JSON object that describes the test case. In this case, it's a simple array reversal problem. There are four different implementations of reversing an array:

1. **Manual Reverse**: This implementation uses a manual loop to iterate through the array and reverse the elements.
2. **Inbuilt Reverse**: This implementation uses the built-in `reverse()` method provided by JavaScript arrays.
3. **XOR Swap**: This implementation uses a bitwise XOR operation to swap two elements without using a temporary variable.
4. **Temp Swap**: This implementation uses a temporary variable to swap two elements.

**Options Compared**

Each option is compared in terms of its performance, which is measured as the number of executions per second.

**Pros and Cons of Each Approach**

1. **Manual Reverse**:
	* Pros: Easy to understand, no dependencies on external libraries.
	* Cons: Inefficient use of memory, slow for large arrays.
2. **Inbuilt Reverse**:
	* Pros: Fast and efficient, built-in method is optimized for performance.
	* Cons: Dependence on external library (the array object), may have overhead due to function call.
3. **XOR Swap**:
	* Pros: No extra memory usage, simple implementation.
	* Cons: Requires understanding of bitwise XOR operations, may be slower due to branching.
4. **Temp Swap**:
	* Pros: Easy to understand, efficient use of memory.
	* Cons: Temporary variable allocation overhead.

**Library and Special JS Features**

None of the options rely on external libraries or special JavaScript features beyond basic arithmetic operations.

**Other Considerations**

The benchmark results show that the inbuilt reverse method is the fastest, followed by the temp swap method. The manual reverse method is slower due to its inefficiency, while the XOR swap method is slower due to its additional branching.

**Alternatives**

If you're looking for alternative implementations or optimization techniques, consider:

1. **Using a more efficient algorithm**: For example, using a two-pointer technique or a recursive approach with memoization.
2. **Caching results**: If the array reversal operation is performed multiple times, caching the results can improve performance.
3. **Parallelizing the test**: Running multiple iterations of each benchmark in parallel can reduce overall execution time.

Keep in mind that these alternatives may require additional overhead and complexity, so it's essential to carefully evaluate their benefits against your specific use case.

Related benchmarks:

reverse2 (version: 0)

Comparing performance of: temp swap vs xor swap vs inbuilt vs manual rvers

Created: 3 years ago by: Guest

Jump to the latest result

temp swap

xor swap

inbuilt

manual rvers

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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