Benchmark: Spread vs Array.splice

Script Preparation code:

var params = [ "hello", true, 7 ]

Tests:

Array spread
var other = [ ...params ];
Array slice
var other = params.slice();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array spread
Array slice

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 break down the provided JSON and explain what's being tested.

**Benchmark Definition**
The provided JSON defines a benchmark named "Spread vs Array.splice". This benchmark compares two approaches to achieve the same result:

1. **Array spread**: Using the spread operator (`...`) to create a new array by copying elements from an existing array.
2. **Array slice**: Using the `slice()` method to create a shallow copy of an array.

**Options being compared**

The two options being compared are:

* Array spread: `var other = [ ...params ];`
* Array slice: `var other = params.slice();`

**Pros and Cons**

### Array Spread

Pros:

* Can be more concise and readable, especially when dealing with small arrays.
* Creates a new array without modifying the original one.

Cons:

* May not work correctly if the spread operator is used in certain contexts (e.g., with `Map` or `Set`) or if it's used on objects instead of arrays.
* Can be slower for large arrays due to the overhead of creating a new array and copying elements.

### Array Slice

Pros:

* More widely supported, as it's a built-in method for arrays in many browsers and languages.
* Faster execution time, especially for large arrays, since it avoids the overhead of creating a new array.

Cons:

* Can be less readable and more verbose than using the spread operator.
* Modifies the original array if used incorrectly (e.g., `params.slice(1)`).

**Library or Special JS Feature**

Neither of these approaches requires any special libraries or JavaScript features beyond standard ES6 syntax.

**Other Considerations**

When choosing between these two approaches, consider the specific use case and requirements:

* If you need to create a new array without modifying the original one, using `Array spread` might be a better choice.
* If performance is critical and you're working with large arrays, `Array slice` could be a more efficient option.

**Alternative Approaches**

Other ways to achieve similar results include:

* Using `Array.prototype.map()` or `Array.prototype.reduce()`, which can create new arrays without modifying the original one. However, these methods might incur additional overhead.
* Using a library like Lodash's `cloneDeep()` function, which provides a more robust way to create deep copies of objects and arrays.

For this specific benchmark, the results are provided in the "Latest benchmark result" section, showing that Chrome Mobile 70 executed both test cases, with slightly faster execution times for the "Array slice" option.

Related benchmarks:

Spread vs Array.splice (version: 0)

Comparing performance of: Array spread vs Array slice

Created: 7 years ago by: Guest

Jump to the latest result

Array spread

Array slice

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):