Benchmark: reduce.concat() vs flat() v.2

Tests:

Array.prototype.flat
var params = [[1, 2], [ "hello", true, 7 ]]; var other = params.flat();
reduce + Array.prototype.concat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => acc.concat(val), []);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to flatten an array of arrays in JavaScript:

1. `flat()` (v2): This method is part of the Array prototype and returns a new, shallow copy of the flattened array.
2. `reduce + Array.prototype.concat`: This approach uses the `reduce()` method to accumulate values from each sub-array into a single array.

**Options Compared**

The two options are compared in terms of their performance, specifically:

* The number of executions per second (ExecutionsPerSecond) on different browsers and devices.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. `flat()` (v2):
	* Pros: Simple, concise, and widely supported.
	* Cons: May have performance issues for very large arrays due to the overhead of creating a new array copy.
2. `reduce + Array.prototype.concat`:
	* Pros: Can be more efficient for large arrays by avoiding the creation of a new array copy.
	* Cons: Requires more code and may have a higher memory footprint.

**Library Used**

In this benchmark, no specific library is used beyond the built-in JavaScript methods (Array.prototype.flat() and Array.prototype.reduce()). However, the use of `var` declarations and the literal syntax for arrays (`[[1, 2], [ "hello", true, 7 ]];`) are characteristic of older JavaScript versions.

**Special JS Feature**

There is no specific special JS feature or syntax being tested in this benchmark. The focus is on comparing two common approaches to flattening an array of arrays.

**Other Alternatives**

If you're looking for alternative ways to flatten an array of arrays, here are a few options:

1. `Array.prototype.map()` + `Array.prototype.concat()`: This approach uses the `map()` method to create a new array with the flattened values and then concatenates them.
2. `Array.prototype.reduce()` without `concat()`: You can use the `reduce()` method to accumulate values from each sub-array, but you'll need to implement the logic yourself.

Keep in mind that these alternatives might not be as efficient or concise as the original approaches being compared in this benchmark.

**Benchmark Result Interpretation**

The latest benchmark result shows that:

* The `reduce + Array.prototype.concat` approach outperforms the `flat()` (v2) method, indicating that this combination is more efficient for flattening large arrays.
* Both approaches perform well on Chrome 92 on a desktop device, suggesting good performance on modern browsers and devices.

Please note that benchmark results can be influenced by various factors, including system resources, browser versions, and hardware specifications. These results should be considered in the context of this specific benchmarking setup.

Related benchmarks:

reduce.concat() vs flat() v.2 (version: 0)

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

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.flat

reduce + Array.prototype.concat

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):