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 copy = letters.slice(); var length = copy.length; for (var i = 0; i < length; i++) { if (copy[i] === "B" || copy[i] === "C") { letters.splice(i, 1); i--; } }
Fix without copy
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
Fix without copy

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark measures the performance of removing elements from an array in JavaScript. The test cases use the `splice` method to remove specific characters ("B" or "C") from the `letters` array, which is initialized with a set of letters.

**Test Cases**

There are four test cases:

1. **Default**: This test case uses the default behavior of the `splice` method, which removes the first occurrence of the specified character.
2. **Reverse**: This test case reverses the order of iteration and removes elements from the end of the array instead of the beginning.
3. **Fix**: In this test case, the code increments the index `i` after removing an element using `splice`. This is intended to fix a potential issue with the default behavior.
4. **Fix without copy**: This test case uses the same approach as the "Fix" test case but omits creating a temporary copy of the array.

**Options Compared**

The benchmark compares the performance of three different approaches:

1. The default behavior of the `splice` method (Test Case 1)
2. Reversing the order of iteration and removing elements from the end of the array (Test Case 2)
3. Incrementing the index `i` after removing an element using `splice` to fix a potential issue (Test Case 3)

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **Default behavior**: Pros: Simple and efficient. Cons: May lead to unexpected behavior if not used carefully.
2. **Reverse iteration**: Pros: Can be more efficient for arrays with a large number of elements at the end. Cons: Requires more iterations, which can be slower for smaller arrays.
3. **Incrementing index**: Pros: Fixes potential issues with the default behavior and can lead to better performance in some cases. Cons: May add unnecessary complexity.

**Other Considerations**

The benchmark also includes the use of a library called `slice` to create a temporary copy of the array. The `slice` method is a built-in JavaScript function that returns a shallow copy of an array.

**Special JS Features or Syntax**

There are no special JS features or syntax used in this benchmark, as it only relies on standard JavaScript constructs like loops, arrays, and the `splice` method.

**Alternative Approaches**

Other approaches to removing elements from an array could include:

1. Using a data structure like a stack or queue instead of an array
2. Utilizing modern JavaScript features like `filter()` or `map()`
3. Implementing a custom data structure or algorithm for efficient removal

However, these alternatives may not be relevant to this specific benchmark, which focuses on the performance characteristics of the `splice` method and its variations.

Related benchmarks:

Remove from array (version: 0)

Remove from array

Comparing performance of: Default vs Reverse vs Fix vs Fix without copy

Created: 9 years ago by: Guest

Jump to the latest result

Default

Reverse

Fix

Fix without copy

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):