Benchmark: reduce.concat() vs flat() - 2lvl only

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce + Array.prototype.concat 2lvl
Array.prototype.flat 2lvl

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36

Browser/OS: Chrome 95 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
reduce + Array.prototype.concat 2lvl	5818049.5 Ops/sec
Array.prototype.flat 2lvl	941407.1 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is comparing two approaches: `reduce()` with the traditional `concat()` method, and the new ES6 spread operator (`...`) with the `flat()` method. The test cases are specifically designed to compare these two methods at the second level (2lvl) of nesting in arrays.

**Options Compared**

Two options are being compared:

1. **`reduce()` with `concat()`**: This approach uses the `Array.prototype.reduce()` method to iterate over the array and concatenate each element using `concat()`. The `reduce()` method is called on an accumulator (`acc`) and returns the new concatenated array.
2. **ES6 spread operator (`...`) with `flat()`**: This approach uses the ES6 spread operator (`...`) to flatten the nested array, followed by the `Array.prototype.flat()` method to flatten it further.

**Pros and Cons of Each Approach**

1. **`reduce()` with `concat()`**:
	* Pros: widely supported across browsers and Node.js versions.
	* Cons: can lead to slower performance due to the concatenation operation.
2. **ES6 spread operator (`...`) with `flat()`**:
	* Pros: generally faster performance compared to `reduce()` + `concat()`, as it avoids unnecessary concatenations.
	* Cons: requires modern browsers or Node.js versions that support ES6 features.

**Library Used**

In the test cases, the `Array.prototype.flat()` method is used, which is a part of the ECMAScript standard and supported by most modern browsers and Node.js versions. The `flat()` method is designed to flatten an array by recursively calling itself until a specified depth (in this case, 2lvl).

**Special JS Feature or Syntax**

The ES6 spread operator (`...`) used in the second test case introduces a new syntax feature that allows for more concise array manipulation.

**Other Alternatives**

If you need to compare other approaches, here are some alternatives:

* Use `Array.prototype.flat()` with a different depth option (e.g., 1lvl or Infinity) to see how performance changes.
* Compare the use of `reduce()` with other iteration methods, such as `forEach()`, `map()`, or `filter()`.
* Test the performance of using ES6 spread operator (`...`) with `flat()` versus using a custom implementation.

Keep in mind that these alternatives may introduce additional complexity and variations in results due to differences in implementation and browser support.

Related benchmarks:

reduce.concat() vs flat() - 2lvl only (version: 0)

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

Comparing performance of: reduce + Array.prototype.concat 2lvl vs Array.prototype.flat 2lvl

Created: 3 years ago by: Registered User

Jump to the latest result

reduce + Array.prototype.concat 2lvl

Array.prototype.flat 2lvl

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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