Benchmark: reduce.concat() vs flat() right way

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Browser/OS: Chrome 102 on Windows

View result in a separate tab

Test name	Executions per second
reduce + Array.prototype.concats	7105487.0 Ops/sec
Array.prototype.flat	868260.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

MeasureThat.net provides a simple benchmarking framework that allows users to compare the performance of different approaches in JavaScript. In this case, we're comparing two methods for merging arrays: `Array.prototype.concat()` and the new ES6 spread operator (`...`).

The test cases are designed to measure the performance of these two approaches on small arrays with varying numbers of elements.

**Options being compared**

There are only two options being compared:

1. **`Array.prototype.concat()`**: This method takes an array as an argument and returns a new array that is a concatenation of the original array and the provided array.
2. **ES6 spread operator (`...`)**: This syntax creates a new array by spreading the elements of the original array into a new array.

**Pros and cons**

Here's a brief summary:

* **`Array.prototype.concat()`**:
	+ Pros: widely supported, well-established method.
	+ Cons: can be slower due to the creation of a new array object, which involves memory allocation and garbage collection.
* **ES6 spread operator (`...`)**:
	+ Pros: concise, efficient, and modern.
	+ Cons: may not be supported in older browsers or environments.

The ES6 spread operator is generally faster than `Array.prototype.concat()` because it avoids creating a new array object and instead uses a more lightweight approach to create the new array.

**Library usage**

There are no libraries used in this benchmark. The test cases only use built-in JavaScript methods and operators.

**Special JS feature or syntax**

The ES6 spread operator (`...`) is a relatively recent addition to the JavaScript language, introduced in ECMAScript 2015 (ES6). It provides a concise way to create new arrays from existing arrays or other iterable sources.

**Other alternatives**

If you wanted to test alternative approaches for merging arrays, some options could include:

* Using `Array.prototype.push()` instead of concatenation.
* Using a library like Lodash (`_.concat()`) or Ramda (`R.concat()`).
* Implementing a custom merge function using iterative techniques (e.g., using `for` loops).

However, these alternatives would likely introduce additional overhead and complexity, making them less suitable for benchmarking purposes.

Related benchmarks:

reduce.concat() vs flat() right way (version: 0)

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

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

Created: 2 years ago by: Guest

Jump to the latest result

reduce + Array.prototype.concats

Array.prototype.flat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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