Benchmark: reduce.concat() vs flat(1) vs custom

Tests:

reduce + Array.prototype.concat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => acc.concat(val), []);
Array.prototype.flat
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat(1);
Custom flat
const flat = (array, depth) => ((Number(depth) > 1) ? array.flat(depth) : array.reduce((a, v) => a.concat(v), [])); var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = flat(params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce + Array.prototype.concat
Array.prototype.flat
Custom flat

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 dive into the world of JavaScript microbenchmarks!

**Benchmark Definition**

The provided JSON represents a benchmark definition for measuring the performance of different approaches to flatten an array in JavaScript. The benchmark is designed to compare three methods:

1. `Array.prototype.concat()`: The traditional way to concatenate arrays.
2. `Array.prototype.flat(1)`: A new ES6 spread operator method introduced in ECMAScript 2019, which flattens an array of arrays into a one-dimensional array.
3. Custom implementation (`flat()` function): A custom flat function implemented by the user.

**Options Compared**

The benchmark compares the performance of these three approaches on two test cases:

1. Test case 1: `reduce + Array.prototype.concat` (using the traditional `concat()` method)
2. Test case 2: `Array.prototype.flat` (using the ES6 spread operator)
3. Test case 3: Custom implementation (`flat()` function)

**Pros and Cons of Each Approach**

Here's a brief analysis of each approach:

1. **Traditional `concat()`**: This is a simple, well-established method for concatenating arrays. However, it can be slow for large arrays due to the overhead of creating new arrays.
	* Pros: Easy to understand and implement.
	* Cons: Slow performance for large arrays.
2. **`Array.prototype.flat(1)`**: The ES6 spread operator provides a more efficient way to flatten arrays by using lazy evaluation and avoiding unnecessary array creations.
	* Pros: Fast performance, especially for large arrays.
	* Cons: Requires modern JavaScript versions (ECMAScript 2019+) and may not be supported in older browsers.
3. **Custom `flat()` implementation**: This approach provides the most control over the flattening process but requires more code and may be slower due to additional overhead.
	* Pros: Customizable, can handle complex cases, and potentially faster for small arrays.
	* Cons: More code required, potentially slower performance.

**Test Case 2: `Array.prototype.flat()`**

This test case uses the ES6 spread operator method to flatten an array of arrays. This approach is designed to be efficient and modern.

**Test Case 3: Custom `flat()` implementation**

This test case implements a custom flat function to demonstrate its potential performance and control over the flattening process.

**Other Considerations**

* **Browser support**: Make sure to consider the compatibility of different browsers when implementing this benchmark, as not all may support the ES6 spread operator.
* **Array sizes**: Varying array sizes can affect the performance differences between these approaches. The benchmark results are likely influenced by the specific array sizes used in the test cases.

**Alternatives**

If you're interested in exploring alternative methods for flattening arrays, consider:

1. Using `Array.prototype.map()` and `Array.prototype.reduce()` together to achieve a similar result.
2. Utilizing libraries like Lodash or Underscore.js, which provide optimized array manipulation functions.
3. Implementing a recursive approach for flatting nested arrays.

Keep in mind that each alternative has its own trade-offs in terms of performance, readability, and maintainability.

Related benchmarks:

reduce.concat() vs flat(1) vs custom (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: reduce + Array.prototype.concat vs Array.prototype.flat vs Custom flat

Created: 5 years ago by: Guest

Jump to the latest result

reduce + Array.prototype.concat

Array.prototype.flat

Custom flat

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):