Benchmark: forEach + push vs flat

Tests:

forEach + push
const arr = []; const x = 2000; while (arr.length < x) { arr.push([{test: ''}]) } for (let i = 0; i < 10; i++) { const newArr = [] arr.forEach((each) => { return newArr.push(each); }); }
flat
const arr = []; const x = 2000; while (arr.length < x) { arr.push([{test: ''}]) } for (let i = 0; i < 10; i++) { const newArr = arr.flat(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach + push
flat

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The provided `benchmark.json` file defines two test cases:

1. `"forEach + push"`: This test case compares the performance of using `Array.prototype.forEach()` in combination with `Array.prototype.push()` versus another approach (not specified).
2. `"flat"`: This test case compares the performance of using `Array.prototype.flat()` against another approach (not specified).

**Options being compared**

For both test cases, the options being compared are:

* Using `forEach` and `push` in a loop
* Using `flat`

**Pros and cons of each approach**

1. `"forEach + push"`:
	* Pros: More explicit iteration and control over the loop.
	* Cons: May have higher overhead due to the need to iterate over the array using `forEach`.
2. `"flat"`:
	* Pros: Simplifies the iteration process, as it returns a new, shallow copy of the array.
	* Cons: May have performance implications if the array is very large or deep.

**Library and purpose**

None of the test cases use any external libraries.

**Special JavaScript feature/syntax**

The `flat()` method uses a built-in JavaScript feature to simplify iteration. Specifically, it uses the `Array.prototype.flat()` method, which was introduced in ECMAScript 2019 (ES10). This method allows you to flatten an array of arrays into a single, one-dimensional array.

**Benchmark preparation code and test case**

The benchmark preparation code is not provided in the specification. However, based on the `benchmark.json` file, it appears that both test cases involve creating an array with 2000 elements using a loop, followed by either using `forEach` and `push`, or using `flat`.

**Other alternatives**

There are other approaches to flatten arrays without using `flat()`:

1. Using `Array.prototype.reduce()`: You can use `reduce()` to concatenate arrays.
```javascript
arr.reduce((acc, current) => acc.concat(current));
```
2. Using a simple loop: You can use a traditional loop to iterate over the array and push elements into a new array.
```javascript
const newArr = [];
for (let i = 0; i < arr.length; i++) {
  newArr.push(arr[i]);
}
```
3. Using `Array.prototype.map()`: You can use `map()` to create a new array with the same number of elements as the original array, but only push the first element into the new array.
```javascript
arr.map((each) => each[0]).forEach((newElement) => {
  newArr.push(newElement);
});
```
These alternatives may have different performance characteristics and may be more or less suitable depending on the specific use case.

Related benchmarks:

forEach + push vs flat (version: 0)

Comparing performance of: forEach + push vs flat

Created: 4 years ago by: Guest

Jump to the latest result

forEach + push

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):