Benchmark: splice vs slice spread v3

Script Preparation code:

const generateRandomString = () => Math.random().toString(36).substring(7);

// Create the currentList object with a long listElements array
const currentList = {
  field1: generateRandomString(),
  field2: generateRandomString(),
  field3: generateRandomString(),
  listElements: Array.from({ length: 10000 }, () => generateRandomString()),
};
let valuesList = [];
for (let i = 0; i < 100; i++){
  
valuesList[i] = Math.floor(Math.random() * currentList.listElements.length)
}

Tests:

splice check
function spliceOperation() { let innerJ = 0; for (let i = 0 ; i < valuesList.length; i++){ innerJ = valuesList[i]; currentList.listElements.splice(innerJ, 1); } }
splice spread
function sliceSpreadOperation() { let innerJ = 0; for (let i = 0 ; i < valuesList.length; i++){ innerJ = valuesList[i]; currentList.listElements = [ ...currentList.listElements.slice(0, innerJ), ...currentList.listElements.slice(innerJ + 1), ]; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice check
splice spread

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The provided benchmark compares two approaches to remove elements from an array in JavaScript: `splice` and `slice/spread`. The script generates a large random string array, creates another object with this array as a property, and then iterates over a list to access indices of the original array. Two test cases are created:

1. `splice check`: Uses `splice` to remove elements from the original array.
2. `splice spread`: Uses `slice/spread` syntax to create a new array with removed elements.

**Options Compared**

The benchmark tests two options:

1. **Splice**: This approach uses the `splice` method, which modifies the original array and returns an array of removed elements.
2. **Slice/Spread**: This approach uses the spread operator (`...`) to create a new array with removed elements, leaving the original array unchanged.

**Pros and Cons**

**Splice:**

Pros:

* Simple and straightforward
* Fast for small arrays

Cons:

* Modifies the original array, which can be problematic if the array is used elsewhere in the code.
* Returns an array of removed elements, which may not be what you expect.

**Slice/Spread:**

Pros:

* Does not modify the original array, preserving its integrity.
* Allows for more control over the new array's structure.

Cons:

* Can be slower than `splice` for large arrays due to the overhead of creating a new array.
* Requires understanding of the spread operator syntax.

**Library and Special JS Features**

There is no explicit library mentioned in this benchmark. However, it does use some special JavaScript features like the spread operator (`...`) and the `const` keyword.

**Other Considerations**

When writing benchmarks like this, it's essential to consider factors like:

* **Array size**: The benchmark uses a large array of 10,000 elements, which is significant enough to demonstrate differences between the two approaches.
* **Loop iterations**: Both test cases iterate over the same list to access indices of the original array, ensuring fair comparison.
* **Browser and device**: The benchmark runs on Chrome 114 on a desktop platform, which is a relatively modern browser.

**Alternatives**

If you're interested in exploring alternative approaches or testing other JavaScript features, some options include:

* Using `filter()` instead of `splice` or `slice/spread`.
* Testing different array initialization methods (e.g., `Array.from()`, `Array.prototype.slice()`, etc.).
* Comparing performance with other languages or libraries.
* Exploring the impact of JavaScript engine optimizations on benchmark results.

By analyzing this benchmark, you can gain insights into the trade-offs between different approaches to modifying arrays in JavaScript and make informed decisions about which approach to use in your own projects.

Related benchmarks:

splice vs slice spread v3 (version: 0)

Comparing performance of: splice check vs splice spread

Created: 2 years ago by: Guest

Jump to the latest result

splice check

splice spread

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):