Benchmark: Remove from array

Script Preparation code:

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

Tests:

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

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.

Let's dive into the provided JavaScript benchmark, MeasureThat.net.

**Benchmark Definition:**
The benchmark definition json represents a test case for removing elements from an array using the `splice()` method. The test is called "Remove from array" and has two main variations:

1. **Default**: This variation uses a traditional `for` loop to iterate over the array, starting from the beginning (`i = 0`). It checks each element if it's either "B" or "C", and if so, removes it using `splice()`.
2. **Reverse**: This variation uses a `for` loop that starts from the end of the array (`i = length - 1`) and moves backwards to the beginning. It performs the same check as the Default variant.
3. **Fix**: This variation is similar to the Reverse variant but includes an additional step: after removing an element, it decrements the `i` index by 1 using `i--`. This might be intended to avoid issues with indexing after removing elements.

**Options Compared:**

* Traditional `for` loop starting from the beginning (`Default`)
* `for` loop starting from the end of the array and moving backwards (`Reverse`)
* Additional decrement step after removing each element (`Fix`)

**Pros and Cons:**

1. **Default**: This is a classic approach, easy to understand, and works well for most cases.
	* Pros: Simple, fast execution, easy to implement
	* Cons: May lead to issues with indexing after removals, can be slower due to the traditional loop
2. **Reverse**: Starting from the end of the array and moving backwards might seem counterintuitive, but it's a clever approach that avoids issues with indexing.
	* Pros: Faster execution, avoids indexing issues, simple implementation
	* Cons: May not be immediately clear to readers, requires careful consideration when writing similar code
3. **Fix**: The additional decrement step might seem like an optimization, but it can lead to unexpected behavior and is generally unnecessary.
	* Pros: None significant; this approach is not recommended

**Libraries and Special Features:**

None of the benchmark test cases use any specific libraries or features that are not part of standard JavaScript.

**Special JS Feature/Syntax:**
There's no explicit mention of special JavaScript features like async/await, generators, or arrow functions in the provided benchmark code. However, some older browsers might have different implementation details for `splice()` or other array methods.

**Other Alternatives:**

If you're interested in optimizing array removals, consider exploring other approaches:

1. **Use a data structure that maintains efficient ordering**, like a linked list or a balanced binary search tree.
2. **Implement an optimized data structure**, such as a skip-list or a treap.
3. **Use an array-based data structure** specifically designed for fast insertion and removal, like a segmented array.

Keep in mind that the most suitable approach depends on your specific use case, performance requirements, and the size of the dataset. MeasureThat.net can help you compare different approaches, but it's essential to consider other factors when making optimizations.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36

Browser/OS: Chrome 57 on Linux

View result in a separate tab

Test name	Executions per second
Default	3722011.8 Ops/sec
Reverse	3866224.8 Ops/sec
Fix	1113624.6 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):