Benchmark: Slice vs Map (jv)

Tests:

slice
var array = Array.from({length: 100}).slice();
map
var array = Array.from({length: 100}).map((item) => item);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
map

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_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.167 YaBrowser/22.7.3.799 Yowser/2.5 Safari/537.36

Browser/OS: Yandex Browser 22 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
slice	301191.6 Ops/sec
map	287392.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON benchmark.

**Benchmark Definition**

The benchmark definition is a simple JavaScript snippet that creates an array using `Array.from` and then either slices or maps over it. The purpose of this benchmark is to compare the performance of two methods: `slice` and `map`.

**Options Compared**

Two options are being compared:

1. **Slice**: This method creates a new array by taking a subset of elements from the original array. In this case, it's creating an array with 100 elements using `Array.from({length: 100}).slice()`.
2. **Map**: This method creates a new array by transforming each element in the original array and returning the results as a new array. In this case, it's mapping over the same array created using `Array.from({length: 100})` and applying the identity function (`(item) => item`) to each element.

**Pros and Cons**

Both methods have their pros and cons:

* **Slice**: Pros:
	+ More concise code
	+ Can be faster for large arrays since it avoids the overhead of creating a new array with transformed elements.
* Cons:
	+ Only creates a subset of the original array, which can lead to memory issues if the slice size is very large.
* **Map**: Pros:
	+ Creates a new array with transformed elements, which can be useful for data transformations or filtering.
	+ More flexible than `slice`, as it allows you to apply any transformation function.
* Cons:
	+ Can be slower for large arrays due to the overhead of creating a new array and applying the transformation function.

**Library and Purpose**

There is no specific library mentioned in the benchmark definition. However, `Array.from` is a built-in JavaScript method that creates a new array from an iterable object (such as an array or string).

**Special JS Feature or Syntax**

None are mentioned explicitly, but it's worth noting that `Array.from` is a modern JavaScript feature introduced in ECMAScript 2015.

**Other Alternatives**

If you were to rewrite this benchmark without using `Array.from`, you could use other methods such as:

* Creating an array with `new Array(100)` and then slicing or mapping over it.
* Using a loop to create the array and apply the transformation function.

However, using `Array.from` is generally considered more concise and efficient, which is why it's the preferred method in this benchmark.

Related benchmarks:

Slice vs Map (jv) (version: 0)

Comparing performance of: slice vs map

Created: one year ago by: Guest

Jump to the latest result

slice

map

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):