Benchmark: comparing Array.from copy and then splice with filter method

Script Preparation code:

var arr = [0,1,2,3,4,5,6,7];

Tests:

copy and splice
var x = Array.from(arr); x.splice(0, 1);
filter array method
arr.filter(function(_, index){ return index !== 0});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
copy and splice
filter array method

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/97.0.4692.71 Safari/537.36

Browser/OS: Chrome 97 on Windows

View result in a separate tab

Test name	Executions per second
copy and splice	3741753.8 Ops/sec
filter array method	10875522.0 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 JSON benchmark definition and its corresponding test cases.

**Benchmark Definition:**

The benchmark is testing three approaches to manipulate an array in JavaScript:

1. `Array.from(arr).splice(0, 1);`
2. `arr.filter(function(_, index){ return index !== 0});`

The goal is to compare the performance of these two methods on a pre-initialized array `arr`.

**Options Compared:**

Two options are being compared:

1. `Array.from()` with `.splice()`: This approach creates a new copy of the original array using `Array.from()` and then removes the first element from the copied array using `.splice()`.
2. `.filter()`: This approach uses the built-in `filter()` method on the original array, which returns a new array with elements that satisfy the provided callback function.

**Pros and Cons:**

1. **`Array.from()` with `.splice()`**:
	* Pros:
		+ Can be more readable for developers familiar with these methods.
		+ Allows for explicit control over the copied array's length and index.
	* Cons:
		+ Creates a new copy of the original array, which can lead to increased memory usage.
		+ May incur additional overhead due to the creation and mutation of a separate array object.
2. **`.filter()`**:
	* Pros:
		+ Eliminates the need for creating an explicit copy of the array.
		+ Can be more efficient in terms of memory usage, as it only creates a new array with the filtered elements.
	* Cons:
		+ May require more complex callback functions to achieve the desired filtering logic.
		+ Can lead to less readable code if not properly understood.

**Library and Special Features:**

There are no libraries explicitly mentioned in this benchmark. However, `Array.prototype.filter()` is a built-in JavaScript method that uses a similar approach to the `.filter()` function used in the benchmark.

No special JavaScript features or syntaxes are being tested in this benchmark.

**Other Alternatives:**

Other approaches to manipulate arrays in JavaScript could include:

* Using `map()` instead of `filter()`
* Utilizing `forEach()` with a callback function
* Leveraging `Array.prototype.reduce()` for array manipulation

However, these alternatives might not be as efficient or readable as the two options being compared in this benchmark.

**Benchmark Preparation Code:**

The preparation code provided creates an initial array `arr` with 8 elements, which is used throughout both test cases.

**Individual Test Cases:**

The benchmark consists of two individual test cases:

1. **"copy and splice"**: This test case uses the `Array.from()` method to create a copy of the original array and then removes the first element using `.splice()`.
2. **"filter array method"**: This test case directly applies the `filter()` method on the original array, which returns a new array with elements that satisfy the provided callback function.

**Latest Benchmark Result:**

The benchmark result shows the performance metrics for both test cases:

* "filter array method" executes approximately 3.74 million times per second.
* "copy and splice" executes around 10.87 million times per second.

These results likely indicate that `Array.from()` with `.splice()` is more efficient than using `filter()`, but further analysis might be needed to confirm this trend.

Related benchmarks:

comparing Array.from copy and then splice with filter method (version: 0)

comparing copy and splice of array with array's filter method

Comparing performance of: copy and splice vs filter array method

Created: 2 years ago by: Guest

Jump to the latest result

copy and splice

filter array method

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):