Benchmark: Reverse array with complex props in JS

Script Preparation code:

var data = [
  [ 1, { key: '0', index: 0 }, 'number' ],
  [ 2, { key: '1', index: 1 }, 'number' ],
  [ 3, { key: '2', index: 2 }, 'number' ],
  [ 4, { key: '3', index: 3 }, 'number' ],
  [ 5, { key: '4', index: 4 }, 'number' ]
]

Tests:

Reverse
data.reverse()
Using map
let result = data; [...result].map(result.pop, result)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Reverse
Using map

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.

Measuring JavaScript performance is a complex task, and the provided benchmark definition helps us understand what's being tested.

**What is being tested?**

The provided JSON represents two test cases for reversing an array in JavaScript:

1. `data.reverse()`: This is a built-in JavaScript method that reverses the order of elements in an array.
2. `let result = data;[...result].map(result.pop, result)`: This is a custom implementation using the spread operator (`[...result]`) and the `map()` function with `pop()` as a callback.

**Options compared**

In this benchmark, two options are being compared:

A) Using the built-in `reverse()` method
B) Creating a new array by spreading the original array and then mapping over it using `pop()`

**Pros and Cons of each approach:**

1. **Built-in `reverse()` method**:
	* Pros:
		+ Fast and efficient ( native JavaScript implementation)
		+ Easy to read and understand
	* Cons:
		+ May not work well with large datasets or complex data structures
2. **Custom implementation using spread and map()**:
	* Pros:
		+ Works well with large datasets and complex data structures
		+ Can be more flexible and customizable
	* Cons:
		+ May be slower due to the overhead of creating a new array and mapping over it
		+ More complex code that may be harder to understand

**Library usage**

There is no library being used in this benchmark. The `reverse()` method is a built-in JavaScript function, and the custom implementation uses native JavaScript features like spread operators and `map()`.

**Special JS feature or syntax**

The benchmark uses modern JavaScript features like spread operators (`[...result]`) and arrow functions ( implicit `=>`), which are part of ECMAScript 2015 (ES6) and later standards. This suggests that the benchmark is designed to test performance on relatively recent browsers.

**Alternatives**

If you were to implement a custom reversal algorithm, some alternatives could be:

* Using `Buffer.reverse()` if working with binary data
* Implementing a recursive function or an iterative approach using queues or stacks

However, these alternatives would likely have similar performance characteristics to the built-in `reverse()` method and the custom implementation using spread and map().

Related benchmarks:

Reverse array with complex props in JS (version: 0)

Comparing performance of: Reverse vs Using map

Created: 2 years ago by: Registered User

Jump to the latest result

Reverse

Using map

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):