Benchmark: Create Set vs loop

Script Preparation code:

var arr = Array(9007199).fill(2)

AخA
 
var arr = Array(9007199).fill(2)

Tests:

Create Set
const _set = new Set(arr)
const _set = new Set(arr)

Loop array

for ( let i = 0; i < arr.length; i++ ) { }

 
for ( let i = 0; i < arr.length; i++ ) { }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
Create Set
Loop array

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36

Browser/OS: Chrome 97 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Create Set	13.8 Ops/sec
Loop array	1.6 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

Let's break down the provided JSON and explain what's being tested in this JavaScript microbenchmark.

What is being tested?

The benchmark tests two approaches to create an array of 9,000,001 elements with a value of 2:

Create Set: This approach creates a new Set instance (const _set = new Set(arr)). A Set in JavaScript is an unordered collection of unique values.
Loop array: This approach uses a traditional for loop to iterate over the array and add each element to the result (although, in this case, it doesn't actually create anything).

Options compared

The two options are:

Creating a new Set instance
Using a traditional for loop to iterate over the array

Pros and cons of each approach

Create Set: Pros:
- Efficiently creates an unordered collection of unique values.
- Can be faster than iterating over the array, especially when dealing with large datasets.
Cons:
- May not be suitable for use cases that require a traditional ordered array or specific ordering.
- Some browsers may have performance issues with Set instances.
Loop array: Pros:
- Suitable for use cases that require a traditional ordered array or specific ordering.
- Well-supported in most browsers.
Cons:
- Can be slower than creating a new Set instance, especially when dealing with large datasets.

Library and purpose

In this case, no external library is required. The built-in Set data structure is used to create the unordered collection of unique values.

Special JS feature or syntax

None mentioned in this benchmark definition. However, it's worth noting that using Set instances can be affected by browser-specific implementations and optimizations.

Other alternatives

If you needed to iterate over an array without creating a new set, alternative approaches could include:

Using the for...in loop with arr[Symbol.iterator]()
Using a library like Lodash or Ramda
Utilizing other data structures, such as arrays or linked lists

However, in this specific benchmark, creating a new Set instance is likely to be faster and more efficient.

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested in this JavaScript microbenchmark.

**What is being tested?**

The benchmark tests two approaches to create an array of 9,000,001 elements with a value of 2:

1. **Create Set**: This approach creates a new `Set` instance (`const _set = new Set(arr)`). A `Set` in JavaScript is an unordered collection of unique values.
2. **Loop array**: This approach uses a traditional for loop to iterate over the array and add each element to the result (although, in this case, it doesn't actually create anything).

**Options compared**

The two options are:

* Creating a new `Set` instance
* Using a traditional for loop to iterate over the array

**Pros and cons of each approach**

* **Create Set**: Pros:
	+ Efficiently creates an unordered collection of unique values.
	+ Can be faster than iterating over the array, especially when dealing with large datasets.
* Cons:
	+ May not be suitable for use cases that require a traditional ordered array or specific ordering.
	+ Some browsers may have performance issues with `Set` instances.
* **Loop array**: Pros:
	+ Suitable for use cases that require a traditional ordered array or specific ordering.
	+ Well-supported in most browsers.
* Cons:
	+ Can be slower than creating a new `Set` instance, especially when dealing with large datasets.

**Library and purpose**

In this case, no external library is required. The built-in `Set` data structure is used to create the unordered collection of unique values.

**Special JS feature or syntax**

None mentioned in this benchmark definition. However, it's worth noting that using `Set` instances can be affected by browser-specific implementations and optimizations.

**Other alternatives**

If you needed to iterate over an array without creating a new set, alternative approaches could include:

* Using the `for...in` loop with `arr[Symbol.iterator]()`
* Using a library like Lodash or Ramda
* Utilizing other data structures, such as arrays or linked lists

However, in this specific benchmark, creating a new `Set` instance is likely to be faster and more efficient.

Related benchmarks:

Create Set vs loop (version: 0)

Comparing performance of: Create Set vs Loop array

Created: 3 years ago by: Guest

Jump to the latest result

Create Set