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); } }

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

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Safari/605.1.15

Browser/OS: Safari 18 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Default	54511496.0 Ops/sec
Reverse	53438296.0 Ops/sec
Fix	96778408.0 Ops/sec

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

LLMs can make mistakes. Check important info.

The provided benchmark measures the performance of removing elements from an array in JavaScript.

**Options Compared:**

There are three options being compared:

1. **Default**: This option uses a traditional for loop with `if` statements to check if each element is equal to "B" or "C". If true, it removes that element from the original array using `splice()`.
2. **Reverse**: In this option, the loop iterates over the array in reverse order (from last index to first). This approach can be beneficial when you want to remove elements from the end of the array.
3. **Fix**: This option is a hybrid of the previous two approaches. Instead of using `splice()` directly on the original array, it uses the `indexOf()` method to find the position of the element to be removed and then uses `splice()` on a copy of the array.

**Pros and Cons:**

* **Default**:
	+ Pros: Easy to understand and implement.
	+ Cons: Can be slower due to the overhead of the `if` statement and `indexOf()` method calls.
* **Reverse**:
	+ Pros: May be faster for arrays with elements at the end, as it avoids the need for `splice()`.
	+ Cons: Can be slower for arrays with elements in the middle or at the beginning due to the reverse iteration.
* **Fix**:
	+ Pros: Balances between speed and simplicity. It uses `indexOf()` method to find the position of the element to be removed, which can be faster than `splice()`, but still avoids modifying the original array.
	+ Cons: May require more overhead due to the additional method call.

**Library and Special JS Features:**

There are no libraries used in this benchmark. However, it does utilize a JavaScript feature called "for...of" loop (used implicitly by the for loop syntax) which is not explicitly mentioned.

**Other Considerations:**

* The benchmark uses a small array of 6 elements to simulate real-world scenarios.
* The test cases are designed to cover different edge cases, such as removing multiple elements and handling empty arrays.
* The benchmark measures the execution time per second, which provides an indication of the performance difference between each option.

**Alternatives:**

Other alternatives for removing elements from an array in JavaScript could include:

* Using `filter()` method instead of `splice()`, like this: `letters = letters.filter(element => element !== 'B' && element !== 'C');`
* Utilizing a library like Lodash, which provides a `removeBy` function that can remove elements from an array based on a predicate.
* Implementing a custom binary search algorithm to find the position of the element to be removed and then using `splice()`.
* Using a data structure like a Set or Map, which allows for efficient removal of elements.

Related benchmarks:

Remove from array (version: 0)

Remove from array

Comparing performance of: Default vs Reverse vs Fix

Created: 9 years ago by: Guest

Jump to the latest result

Default

Reverse

Fix

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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