Benchmark: remove first item of array

Script Preparation code:

var list = [0,2,3,4]

Tests:

shift
list.shift()
filter
list.filter(item => item != 0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
shift
filter

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/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36 Edg/116.0.1938.76

Browser/OS: Chrome 116 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
shift	31113128.0 Ops/sec
filter	28174152.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided benchmark definition represents a simple task: removing the first item from an array using two different approaches:

1. `list.shift()`
2. `list.filter(item => item != 0)`

This benchmark tests the performance of these two methods in removing the first element from an array.

**Options Compared**

Two options are being compared:

1. **`shift()`**: This method removes and returns the first element from the array, shifting all other elements down by one index.
2. **`filter()`**: This method creates a new array with all elements that pass the test implemented by the provided function (in this case, `item => item != 0`). The original array is not modified.

**Pros and Cons of Each Approach**

1. **`shift()`**:
	* Pros: Directly removes the first element, no need to create a new array.
	* Cons: Can be slower if the array is large, as it involves shifting all elements after the removed one.
2. **`filter()`**:
	* Pros: More flexible and can handle complex filtering logic, without modifying the original array.
	* Cons: Creates a new array with the filtered elements, which can be slower for large arrays.

**Library Usage**

In both test cases, no libraries are explicitly mentioned. However, `filter()` method is often implemented using the Array.prototype.filter() function, which is a built-in JavaScript method. The `filter()` function uses the `Array.prototype.forEach()` and `Array.prototype.includes()` methods under the hood to implement its logic.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in these benchmark definitions. They are straightforward examples of array manipulation using built-in methods.

**Other Alternatives**

If you wanted to test alternative approaches, here are a few ideas:

1. **Using `splice()`**: Instead of `shift()`, you could use the `splice()` method to remove the first element from the array.
2. **Using recursion**: You could write a recursive function to remove the first element from an array, but this would likely be slower than the built-in methods.
3. **Using bitwise operations**: If you're interested in exploring more exotic approaches, you could try using bitwise operations (e.g., `>>>` or `<<`) to manipulate the array elements.

These alternatives are not typically used for benchmarking array manipulation tasks, as they may introduce unnecessary overhead and complexity. However, experimenting with different approaches can be interesting from a theoretical perspective!

Related benchmarks:

remove first item of array (version: 0)

Comparing performance of: shift vs filter

Created: one year ago by: Guest

Jump to the latest result

shift

filter

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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