Benchmark: slice with indexof vs filter

Script Preparation code:

var test=Array.from({length: 100},(v, i) => i)

Tests:

slice
test.splice(test.indexOf(50), 1);
filter
test.filter((e)=>e!=50)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
filter

Fastest: N/A

Slowest: N/A

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/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Windows

View result in a separate tab

Test name	Executions per second
slice	16866438.0 Ops/sec
filter	29121976.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance benchmarks can be quite fascinating, and I'm excited to break down the provided benchmark for you.

**What is being tested?**

The provided benchmark tests the performance of two different approaches: `splice` with `indexOf` and `filter`. Specifically, it measures how many elements are removed from an array using each approach.

**Options compared**

There are two options being compared:

1. **Splice with indexOf**: This involves finding the index of a specific element (in this case, 50) using `indexOf`, and then removing the specified number of elements starting at that index.
2. **Filter**: This involves creating a new array that includes only the elements that do not match a certain condition (in this case, an element that is equal to 50).

**Pros and Cons of each approach**

1. **Splice with indexOf**:
	* Pros: Can be faster for smaller arrays because it avoids iterating over the entire array.
	* Cons: Has to find the index of the target element first, which can be slow for large arrays.
2. **Filter**:
	* Pros: Avoids finding the index of the target element, making it generally faster for larger arrays.
	* Cons: May be slower than `splice` because it creates a new array with filtered elements.

**Library usage**

There is no explicit library mentioned in this benchmark, but it's worth noting that `Array.prototype.splice()` and `Array.prototype.indexOf()` are built-in JavaScript methods. However, some libraries may provide optimized implementations or shortcuts for these operations.

**Special JS feature or syntax**

None are explicitly mentioned in the provided benchmark code. However, it's worth mentioning that modern JavaScript versions (ECMAScript 2015+) support `const` and `let` declarations, which can affect performance and optimizations in certain cases.

**Other considerations**

* The use of `Array.from()` to create an initial array is a good practice for creating arrays with a specific length.
* The benchmark uses an empty string as the "Html Preparation Code", indicating that no HTML-related code is executed before running the test case.
* It's worth noting that this benchmark only tests the performance of two simple operations. In a real-world scenario, you might want to consider more complex use cases and edge conditions.

**Alternatives**

If you're looking for alternatives or variations on this benchmark, here are some suggestions:

1. Test `splice` with different offsets or lengths.
2. Compare the performance of `filter()` against `map()` for similar operations.
3. Use a larger array size to see how the algorithms scale.
4. Add additional conditions to the filter function to make it more complex.

These variations can help you explore different scenarios and optimize your JavaScript code further.

Related benchmarks:

slice with indexof vs filter (version: 0)

Comparing performance of: slice vs filter

Created: 5 years ago by: Guest

Jump to the latest result

slice

filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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