Benchmark: splice vs set javascript

Script Preparation code:

var array = new Array(100).map((a, i) => i)
var set = new Set(array)

Tests:

splice
array = array.splice(1, 0)
set
set.delete(1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice
set

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; rv:109.0) Gecko/20100101 Firefox/115.0

Browser/OS: Firefox 115 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
splice	13921678.0 Ops/sec
set	49786024.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking test case.

**Benchmark Definition**

The benchmark tests two different approaches to manipulate arrays: using `splice()` and using `Set` data structure. The script preparation code for both cases is:

*   Creates an array with 100 elements, where each element is a unique integer from 0 to 99.
*   Assigns this array to the variable `array`.
*   Creates a new `Set` object from the `array` using the `map()` function. The resulting set is assigned to the variable `set`.

The test case consists of two individual benchmarks:

1.  "splice"
2.  "set"

**Options Compared**

The benchmark compares two different approaches for array manipulation:

1.  Using the `splice()` method.
2.  Using a `Set` data structure.

**Pros and Cons of Different Approaches**

*   **Splice() Method:**
    *   Pros:
        *   Widely supported by most JavaScript engines, including older versions.
        *   Can be used to dynamically remove or insert elements at specific indices.
    *   Cons:
        *   May have performance overhead due to the creation of a new array when using `splice()` for removal.
        *   In some cases (like this benchmark), can be slower compared to using a `Set` data structure.

*   **Set Data Structure:**
    *   Pros:
        *   Typically faster than using `splice()` because it does not require the creation of a new array.
        *   Does not involve shifting elements, which can improve performance in some cases.
    *   Cons:
        *   Not supported by older JavaScript engines (e.g., Internet Explorer 9 and below).
        *   May be less intuitive for developers familiar with `splice()`.

**Library and Purpose**

In the provided benchmark definition json, a library called "Set" is used. The `Set` data structure provides an efficient way to store unique values in JavaScript. It's implemented as a hash table under the hood, allowing for fast membership testing, insertion, deletion, and lookup operations with an average time complexity of O(1).

**Special JS Feature or Syntax**

The provided benchmark does not use any special JavaScript features or syntax beyond what is commonly available in most browsers.

**Other Considerations**

When interpreting these results, consider the context:

*   **Browser Support**: The test should be run on a range of browsers to ensure compatibility with different versions.
*   **Hardware and Network Conditions**: Running the benchmark under controlled network conditions (e.g., a fast local machine) can provide more reliable results.

Related benchmarks:

splice vs set javascript (version: 0)

Comparing performance of: splice vs set

Created: one year ago by: Guest

Jump to the latest result

splice

set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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