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

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
var x = 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

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The website provides a JSON object that represents the benchmark definition. The key fields in this object are:

* `Name`: A unique name for the benchmark.
* `Description`: A brief description of the benchmark, which is "comparing copy and splice of array with array's filter method ".
* `Script Preparation Code`: The JavaScript code that sets up the test environment before running the actual benchmark. In this case, it creates an array `arr` with values from 0 to 7.
* `Html Preparation Code`: An empty string, indicating that no HTML preparation is needed for this benchmark.

**Individual Test Cases**

The website provides two individual test cases as part of the benchmark:

1. **Test Case 1: "copy and splice"**
	* `Benchmark Definition`: This line of code creates a copy of the original array `arr` using `Array.from(arr)`, then removes the first element from the copied array using `x.splice(0, 1)`.
	* Purpose: This test case measures the performance of copying an entire array and then removing elements from it.
2. **Test Case 2: "filter array method"**
	* `Benchmark Definition`: This line of code creates a new array `x` by filtering out elements from the original array `arr` using the `Array.prototype.filter()` method. The callback function returns `true` if the index is not equal to 0.

**Options Compared**

The two test cases compare different approaches for removing or modifying an element in an array:

* **Copy and splice**: Create a copy of the entire array, modify it (remove an element), and then remove that element from the original array.
* **Filter array method**: Use the `Array.prototype.filter()` method to create a new array with only the elements that pass a test (in this case, not being equal to 0).

**Pros and Cons of Different Approaches**

1. **Copy and splice**: This approach has several pros:
	* It avoids modifying the original array.
	* It provides an exact copy of the original array, which can be useful for other tests.
However, it also has some cons:
	* It requires creating a new copy of the entire array, which can lead to increased memory usage.
	* Removing elements from the copied array and then removing them from the original array can result in slower performance due to extra operations.
2. **Filter array method**: This approach is more concise and efficient because it only modifies the existing array:
	+ It avoids creating a new copy of the entire array, which reduces memory usage.
	+ It removes elements directly from the original array without requiring additional operations.

**Library Used**

In this benchmark, no explicit library is used. However, some JavaScript features like `Array.prototype.filter()` are part of the ECMAScript standard and widely supported across browsers.

**Special JS Features or Syntax**

There is no explicit mention of any special JavaScript features or syntax in the provided code.

**Other Considerations**

When analyzing performance benchmarks like this one:

* **Consider memory usage**: The copy-and-splice approach may lead to increased memory usage due to creating a new copy of the entire array.
* **Focus on efficiency**: Measuring execution speed is crucial, but it's also essential to consider how different approaches affect other aspects, such as memory usage and accuracy.

**Alternatives**

Some alternative approaches to removing or modifying elements in an array include:

* Using `splice()` directly on the original array (similar to the copy-and-splice approach, but with less overhead).
* Creating a new array using `map()`, `forEach()`, or other methods that avoid modifying the original array.
* Using libraries like Lodash or Underscore.js, which provide more efficient and concise ways to manipulate arrays.

Keep in mind that these alternatives may have trade-offs depending on your specific use case and requirements.

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	3705385.2 Ops/sec
filter array method	10870056.0 Ops/sec

Related benchmarks:

comparing Array.from copy and then splice with filter method to variable (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 25 days ago):