Benchmark: SpredOrSlice - MeasureThat.net

Tests:

spred
const arr = [1,2,3,4,5] const newArr = [...arr]
slice
const arr = [1,2,3,4,5] const newArr = arr.slice()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spred
slice

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; arm_64; Android 12; M2007J20CG) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.124 YaBrowser/22.9.6.73.00 SA/3 Mobile Safari/537.36

Browser/OS: Yandex Browser 22 on Android

View result in a separate tab

Test name	Executions per second
spred	30340842.0 Ops/sec
slice	54724164.0 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 JSON and benchmark results.

**Benchmark Definition**
The benchmark definition is a JavaScript script that creates an array `arr` with five elements, `[1,2,3,4,5]`. Then, it defines two test cases:

1. `spred`: Creates a new array `newArr` by spreading the original array `arr`.
2. `slice`: Creates a new array `newArr` by using the `slice()` method on the original array `arr`.

**Options Compared**
The benchmark compares the performance of two approaches for creating a new array:

1. **Spreading**: Using the spread operator (`...`) to create a new array from the original array.
2. **Slice Method**: Using the `slice()` method on the original array to create a new array.

**Pros and Cons**

* **Spreading**
	+ Pros:
		- Creates a shallow copy of the array, which can be useful in some cases.
		- Can be faster for small arrays or when used in combination with other methods (e.g., `concat()`).
	+ Cons:
		- Can lead to unexpected behavior if the original array contains non-array elements or has certain properties set (e.g., `null` or `undefined` values).
* **Slice Method**
	+ Pros:
		- Creates a shallow copy of the array, which can be useful in some cases.
		- More predictable and safer than spreading, as it doesn't execute arbitrary code.
	+ Cons:
		- Can lead to slower performance compared to spreading for large arrays.

**Library and Purpose**
None are mentioned explicitly in this benchmark definition. However, the `slice()` method is a built-in JavaScript function that creates a new array by copying elements from an original array.

**Special JS Feature or Syntax**
None are mentioned explicitly in this benchmark definition.

**Other Alternatives**
There are other ways to create a new array, such as:

* Using the `Array.prototype.slice.call()` method (not shown in this benchmark).
* Using `Array.from()` with an iterable (not shown in this benchmark).

Keep in mind that these alternatives might not be included in the specific benchmark results you provided.

**Context and Considerations**
When working with arrays, it's essential to consider the trade-offs between different approaches. For example:

* If you need a shallow copy of the array for certain operations or when used as an argument in a function, spreading might be a better choice.
* However, if you need a deep copy or want to ensure predictability and safety, using the `slice()` method or another copying approach might be more suitable.

Keep in mind that the performance differences between these approaches are usually negligible for small arrays. As the size of the array increases, the benefits of using one approach over another may become more apparent.

Related benchmarks:

SpredOrSlice (version: 0)

faster

Comparing performance of: spred vs slice

Created: one year ago by: Guest

Jump to the latest result

spred

slice

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):