Benchmark: slice vs set javascript

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
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
slice	26555700.0 Ops/sec
set	51980668.0 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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of `Array.prototype.slice()` and `Set` data structures in JavaScript. The test creates an array with 100 elements, maps each element to its index, and then passes this array to both `slice()` and `set()` methods.

**Options Compared**

There are two main options being compared:

1. **Array.prototype.slice()**: This method returns a new array containing all elements from the original array, starting at the specified index (in this case, 1) and going to the end of the array.
2. **Set**: This is a built-in JavaScript data structure that stores unique values. In this test, an empty set is created and populated with the array elements.

**Pros and Cons**

* **Array.prototype.slice()**:
	+ Pros: Efficient for large datasets, as it only returns references to existing elements.
	+ Cons: Can be slower than `Set` for small to medium-sized arrays due to its overhead in creating a new array.
* **Set**:
	+ Pros: Fast and efficient for adding or removing elements, especially when dealing with unique values.
	+ Cons: May perform worse than `slice()` for large datasets, as it needs to iterate over all elements.

**Library/Utility**

In this test case, there is no specific library or utility being used beyond the built-in JavaScript `Array` and `Set` types. However, if we consider the `map()` method used in the script preparation code, it's worth noting that `map()` is a part of the ECMAScript specification and has been supported by most modern browsers for many years.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. The focus is solely on comparing the performance of two built-in data structures (`Array.prototype.slice()` and `Set`).

**Other Alternatives**

If you were to design a similar benchmark, you might also consider testing:

1. **Array.prototype.forEach()**: This method iterates over an array without returning any values.
2. **Array.prototype.reduce()**: This method reduces an array to a single value using a callback function.
3. **Object.create() vs Object.assign()**: These two methods create new objects and can be used in place of `Set` for storing unique values.

Keep in mind that the specific alternatives will depend on your goals and requirements for testing JavaScript performance.

Related benchmarks:

slice vs set javascript (version: 0)

Comparing performance of: slice vs set

Created: one year ago by: Guest

Jump to the latest result

slice

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):