Benchmark: Remove from array

Script Preparation code:

var letters = ["A", "B", "C", "D", "E", "F"];

Tests:

Default
var length = letters.length; for (var i = 0; i < length; i++) { if (letters[i] === "B" || letters[i] === "C") { letters.splice(letters.indexOf(letters[i]), 1); } }
Reverse
var length = letters.length; for (var i = length - 1; i >= 0; i--) { if (letters[i] === "B" || letters[i] === "C") { letters.splice(i, 1); } }
Fix
var length = letters.length; for (var i = 0; i < length; i++) { if (letters[i] === "B" || letters[i] === "C") { letters.splice(i--, 1); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Default
Reverse
Fix

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark measures the performance of removing elements from an array in JavaScript. The test case uses a predefined array `letters` containing 6 elements, and it checks for two conditions: if an element is equal to either "B" or "C". The benchmark defines three different approaches:

1. **Default**: Iterates through the array from left to right (i.e., `for (var i = 0; i < length; i++)`).
2. **Reverse**: Iterates through the array from right to left (i.e., `for (var i = length - 1; i >= 0; i--)`).
3. **Fix**: Uses the decrementing index feature (`letters.splice(i--, 1);`) to improve performance.

**Options Comparison**

The benchmark compares the performance of these three approaches:

* **Default** and **Reverse** are straightforward iterations through the array.
	+ **Pros**: Easy to understand, implement, and maintain. Good for developers who prefer a simple approach.
	+ **Cons**: May not be optimized for performance, especially for large arrays.
* **Fix** uses the decrementing index feature to improve performance by avoiding the need to calculate the new index (`i--`) in each iteration.
	+ **Pros**: Can lead to better performance, as it reduces the number of calculations required. This approach takes advantage of JavaScript's increment/decrement operators.
	+ **Cons**: May be less intuitive for developers who are not familiar with this specific optimization technique.

**Library and Special JS Features**

The benchmark uses the `Array.prototype.splice()` method, which is a built-in JavaScript function for removing elements from an array. This approach does not require any external libraries or dependencies.

However, it's worth noting that the decrementing index feature (`i--`) used in the **Fix** approach is a specific syntax feature of JavaScript. It decrements the value of `i` and returns its new value. This feature allows for concise code and can improve readability.

**Other Considerations**

When writing benchmarks like this, consider the following:

* Choose a representative test case that accurately represents the scenario you're trying to measure.
* Ensure that your benchmark is well-structured and easy to understand.
* Use clear and descriptive variable names and comments to explain your approach.
* Make sure your benchmark is repeatable and consistent across different runs.

**Alternative Benchmark Approaches**

For an alternative approach, consider using:

* **Array.prototype.filter()**: Instead of removing elements from the array, you could filter out the unwanted elements. This approach might lead to better performance for large arrays.
* **Using a custom loop or library function**: Depending on the specific requirements of your benchmark, you could explore alternative loops (e.g., `for...of` loop) or even use external libraries optimized for array manipulation.

However, in this case, the provided test cases and the results already indicate that the decrementing index feature (`i--`) provides a performance boost, making it an attractive approach to consider.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Linux

View result in a separate tab

Test name	Executions per second
Default	2863705.0 Ops/sec
Reverse	2832013.5 Ops/sec
Fix	2853408.5 Ops/sec

Related benchmarks:

Remove from array (version: 0)

Remove from array

Comparing performance of: Default vs Reverse vs Fix

Created: 7 years ago by: Guest

Jump to the latest result

Default

Reverse

Fix

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):