Benchmark: concat and push1

HTML Preparation code:

<script src=''></script>

Script Preparation code:

var arr1 = Array.from(Array(50000), (x,i) => i + 1)
var arr2 = Array.from(Array(50000), (x,i) => i - 1)

Tests:

concat
arr1 = arr1.concat(arr2)
push
arr1.push(arr2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
push

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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**Benchmark Description**

The benchmark is called "concat and push1" and its purpose is to compare the performance of two JavaScript methods: `Array.prototype.concat()` and `Array.prototype.push()`. These methods are used to add elements to an array.

**Test Cases**

There are two test cases:

1. **Concat Test**: This test case uses the `Array.prototype.concat()` method to concatenate two arrays, `arr1` and `arr2`, which have 50,000 elements each.
	* The code creates two large arrays using `Array.from()` and assigns them to `arr1` and `arr2`.
	* Then, it concatenates these two arrays using `arr1 = arr1.concat(arr2)`.
2. **Push Test**: This test case uses the `Array.prototype.push()` method to add elements from one array (`arr2`) to another array (`arr1`).
	* The code creates the same large arrays as above.
	* Then, it pushes all elements of `arr2` onto `arr1` using `arr1.push(arr2)`.

**Library and JavaScript Features**

No external libraries are used in this benchmark. However, two JavaScript features are employed:

* **Array.from()**: This method is used to create arrays from iterable objects (like arrays or NodeLists). In the preparation code, it's used to create large arrays with 50,000 elements each.
* **concat()** and **push()** methods: These are built-in array methods that modify an array by adding elements. They are compared in this benchmark.

**Pros/Cons of Each Approach**

Here are some considerations:

* **Concat**: This method creates a new array containing all elements from both input arrays. It can be slower for large inputs because it needs to allocate memory for the resulting array.
	+ Pros: Simple and easy to understand, suitable for small inputs or cases where you need to merge two arrays.
	+ Cons: May incur performance overhead for large inputs due to memory allocation.
* **Push**: This method modifies an existing array by adding elements from another iterable. It's generally faster than concat because it reuses the original array's memory.
	+ Pros: Faster and more efficient than concat, suitable for cases where you need to add many elements to a single array.
	+ Cons: Can modify the original array, which might not be desirable in all situations.

**Other Alternatives**

If you're looking for alternative methods to concatenate or push arrays:

* **Spread operator**: `arr1 = [...arr2, ...arr1]` is an efficient way to merge two arrays. It uses the spread operator (`...`) to "spread" elements from one array into another.
* **Map() and reduce()**: You can also use these methods in combination to concatenate or sum up arrays.

These alternatives are not used in this specific benchmark, but they demonstrate other ways to achieve similar goals.

Related benchmarks:

concat and push1 (version: 0)

Comparing performance of: concat vs push

Created: 6 years ago by: Guest

Jump to the latest result

concat

push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):