Benchmark: reduce/concat vs flatMap v2

Script Preparation code:

var server = {
	routes: [
      ['v1', [{ url: 'v1' }]],
      ['v2', [{ url: 'v2' }]]
    ]
}

Tests:

reduce/concat
const routes = Array.from(server.routes).reduce((routes, [_, route]) => { return routes.concat(route); }, []);
flatMap
const routes = Array.from(server.routes).flatMap((routes) => { const [_, route] = routes; return route; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce/concat
flatMap

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what is being tested.

**Benchmark Definition**

The benchmark is designed to compare two approaches for processing an array of routes:

1. `reduce/concat`: This approach uses the `Array.prototype.reduce()` method to iterate over the array of routes, concatenating each route to a cumulative result array.
2. `flatMap v2`: This approach uses the `Array.prototype.flatMap()` method (introduced in ECMAScript 2019) to iterate over the array of routes and flatten it into an array of individual route objects.

**Options Compared**

The benchmark is comparing two approaches:

* `reduce/concat`
* `flatMap v2`

**Pros and Cons**

1. **Reduce/Concat**
	* Pros:
		+ Widely supported across older browsers (IE 11+, Edge 12+)
		+ Can be more efficient for small arrays
	* Cons:
		+ Requires more memory allocation (creating a new array to store the cumulative result)
		+ Can lead to slower performance due to the overhead of concatenating strings
2. **flatMap v2**
	* Pros:
		+ More concise and readable code
		+ Efficient use of memory, as it only creates a new array with the flattened elements
	* Cons:
		+ Requires support for ECMAScript 2019 or later (Chrome 102+, Firefox 84+, Edge 17+)
		+ May not be supported in older browsers

**Library and Purpose**

The `server.routes` object is using the `Array.prototype.reduce()` method to process an array of routes. This method iterates over the array, applying a callback function to each element, which in this case concatenates each route to the cumulative result array.

**Special JavaScript Feature**

The benchmark uses the `flatMap()` method (introduced in ECMAScript 2019) to flatten the array of routes into an individual array of route objects. This feature is not supported in older browsers and requires specific browser versions or ES modules setup.

**Other Alternatives**

If you need to support older browsers, you can consider using other approaches, such as:

1. Using `forEach()` method instead of `reduce()`
2. Using a custom loop with indexing to process the array
3. Using `Array.prototype.map()` and then concatenating the resulting arrays

Keep in mind that these alternatives may have different performance characteristics and code readability.

For modern browsers and projects, using `flatMap()` or similar methods (e.g., `Array.prototype.flat()`) is usually a good choice for their conciseness and efficiency.

Related benchmarks:

reduce/concat vs flatMap v2 (version: 0)

Comparing performance of: reduce/concat vs flatMap

Created: 3 years ago by: Guest

Jump to the latest result

reduce/concat

flatMap

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):