Benchmark: set vs array iteration new

Script Preparation code:

var a = Array(100000);
var b = new Set(a)

Tests:

array
for (const x of a) {}
set
for (const x of b) {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array
set

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array	21993.0 Ops/sec
set	29082090.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition JSON**

The provided JSON represents a benchmark that tests two different approaches: using an array and using a Set data structure to iterate over a large dataset.

**What is being tested?**

In this benchmark, we're comparing the performance of iterating over a large dataset using two different methods:

1. **Array iteration**: The first test case uses an array (`a`) with 100,000 elements. It iterates over the array using a traditional `for` loop.
2. **Set iteration**: The second test case uses a Set data structure (`b`) initialized with the same 100,000-element array. It iterates over the Set using another traditional `for` loop.

**Options compared**

The two options being compared are:

* **Array iteration**: A traditional `for` loop that iterates over an array.
* **Set iteration**: A traditional `for` loop that iterates over a Set data structure.

**Pros and Cons of each approach**

* **Array iteration**:
	+ Pros: Easy to understand, widely supported, and efficient for small datasets.
	+ Cons: Can be slow for large datasets due to the need to access and index each element individually.
* **Set iteration**:
	+ Pros: Fast and efficient for large datasets, as Sets use a hash table to store elements, allowing for O(1) lookups.
	+ Cons: May require additional memory, as Sets can allocate more memory than arrays.

**Library and purpose**

In this benchmark, the `Array` and `Set` objects are built-in JavaScript data structures. The `Array` object is used for storing collections of elements, while the `Set` object provides a fast and efficient way to store unique values.

**Special JS feature or syntax**

There are no special JS features or syntaxes mentioned in this benchmark. It's a straightforward comparison between two basic iteration methods.

**Other alternatives**

If you're looking for alternative approaches to iterating over large datasets, consider the following:

* **For...of loops**: Introduced in ECMAScript 2015 (ES6), these loops provide a concise way to iterate over iterable objects.
* **Iterators and Generators**: These are more advanced techniques that allow for fine-grained control over iteration, but can be more complex to implement.

**Benchmark preparation code**

The script preparation code is provided as:
```javascript
var a = Array(100000);
var b = new Set(a);
```
This initializes an array with 100,000 elements and creates a new Set from it.

Related benchmarks:

set vs array iteration new (version: 0)

Comparing performance of: array vs set

Created: 2 years ago by: Guest

Jump to the latest result

array

set

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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