Benchmark: swap test - MeasureThat.net

Tests:

2017 swap
let swap = ([a, b]) => [b, a]; let inArr = [5, 7]; let outArr = swap(inArr); console.log(outArr[0], outArr[1]);
1824 swap
let inA = 5; let inB = 7; inA ^= inB; inB ^= inA; inA ^= inB; console.log(inA, inB);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
2017 swap
1824 swap

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and benchmark code to understand what is being tested.

**Benchmark Overview**

The benchmark tests two different ways of swapping values in an array. The goal is to compare the performance of these two approaches.

**Approach 1: Using Array Destructuring**

```javascript
let swap = ([a, b]) => [b, a];
let inArr = [5, 7];
let outArr = swap(inArr);
console.log(outArr[0], outArr[1]);
```

In this approach, we define a function `swap` that takes an array as an argument and returns a new array with the elements swapped. We then create an input array `inArr`, pass it to the `swap` function, and store the result in `outArr`. Finally, we log the swapped values.

**Approach 2: Using XOR Operator**

```javascript
let inA = 5;
let inB = 7;

inA ^= inB;
inB ^= inA;
inA ^= inB;

console.log(inA, inB);
```

In this approach, we use the XOR operator (`^`) to swap the values of two variables. The XOR operator has a property that `a ^ b` is equal to `b ^ a`, which allows us to swap the values without using a temporary variable.

**Pros and Cons**

* **Approach 1 (Array Destructuring)**:
	+ Pros: Easy to read and understand, explicit swapping of elements.
	+ Cons: Creates a new array, which can be memory-intensive for large inputs.
* **Approach 2 (XOR Operator)**:
	+ Pros: Memory-efficient, fast execution.
	+ Cons: Less readable, requires understanding of XOR operator properties.

**Library/Functionality**

There is no library or external functionality used in these benchmarks. The only built-in function used is the `console.log` function for logging the output.

**Special JS Feature/Syntax**

The XOR operator (`^`) is a special JavaScript operator that performs bit-wise XOR operation. It's not a commonly used feature, but it can be useful in specific situations like swapping values.

**Other Alternatives**

For swapping two variables without using a temporary variable, other approaches include:

* Using `let temp = a; let b = c; a = b; b = temp;` (more verbose and slower)
* Using `a = [b, a][0]; b = [b, a][1];` (creates a new array, similar to Approach 1)

The benchmark's goal is to compare the performance of these two approaches and provide insights into their relative speed and memory usage.

Related benchmarks:

swap test (version: 0)

Comparing performance of: 2017 swap vs 1824 swap

Created: 8 years ago by: Guest

Jump to the latest result

2017 swap

1824 swap

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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