Benchmark: Splice vs shift to remove at beginning of array (fixed from slice)

Script Preparation code:

var array = Array.from({ length: 100 }).map((val, i) => i);

Tests:

Splice
var newArray = array.splice(0, 0);
shift
var newArray = array.shift();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
shift

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**What is being tested?**

The main focus of this benchmark is to compare two approaches for removing an element from the beginning of an array in JavaScript: `splice` with a fixed length of 0, and `shift`.

**Options compared**

Two options are being compared:

1. **Splice (with fixed length)**: This approach uses the `splice` method with a fixed length of 0, which returns a new array containing all elements from the original array without modifying it.
2. **Shift**: This approach uses the `shift` method, which removes the first element from the array and returns it as a value.

**Pros and cons**

Here are some pros and cons for each approach:

*   **Splice (with fixed length)**:
    *   Pros:
        *   More efficient because it avoids copying elements unnecessarily.
        *   Can be more flexible if you need to remove multiple elements at once.
    *   Cons:
        *   May require creating a new array, which can lead to memory allocation overhead.
        *   Can be slower in some cases due to the overhead of creating a new array.
*   **Shift**:
    *   Pros:
        *   Generally faster because it avoids copying elements unnecessarily.
        *   Can be simpler to use and understand, especially for small arrays.
    *   Cons:
        *   May not be as flexible if you need to remove multiple elements at once.

**Other considerations**

When choosing between `splice` and `shift`, consider the following:

*   **Array size**: For large arrays, `splice` might be more efficient because it avoids copying elements unnecessarily.
*   **Performance requirements**: If performance is critical, use `shift`.
*   **Code readability and maintainability**: Use `splice` if you need to remove multiple elements or want a more explicit way of modifying the array.

**Library usage**

There is no library mentioned in the benchmark definition.

**Special JavaScript features or syntax**

This benchmark does not use any special JavaScript features or syntax, making it accessible to a wide range of software engineers.

**Alternatives**

Other alternatives for removing an element from the beginning of an array include:

*   **Array destructuring**: Using destructuring assignment to extract elements from the beginning of the array.
*   **Using `slice()`**: Similar to `splice` but with fewer options (only the start and end indices).

Here's a simple example using array destructuring:
```javascript
const [newArray, ...rest] = array;
```
This approach is concise and efficient for small arrays.

Related benchmarks:

Splice vs shift to remove at beginning of array (fixed from slice) (version: 0)

Comparing performance of: Splice vs shift

Created: 2 years ago by: Guest

Jump to the latest result

Splice

shift

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):