Benchmark: Fill up Set from array

Script Preparation code:

var stuff = Array(1000).fill('tag').map((item, index) => item + index)

Tests:

Constructor
var set = new Set(stuff)
Loop
var set = new Set() for (let i=0; i < stuff.length; i += 1) { set.add(stuff[i]) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Constructor
Loop

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The benchmark tests two different approaches to create a new Set from an array of data:

1. **Constructor**: Using the `Set` constructor with the array as an argument (`new Set(stuff)`).
2. **Loop**: Iterating over the array using a for loop and adding each element to the set individually (`for (let i=0; i < stuff.length; i += 1) { set.add(stuff[i]) }`).

**What are the options compared?**

The two test cases compare the performance of creating a new Set from an array:

* Using the `Set` constructor directly with the array as an argument (`new Set(stuff)`).
* Iterating over the array using a for loop and adding each element to the set individually.

**Pros and cons of different approaches:**

1. **Constructor**: This approach is concise and efficient, as it takes advantage of the browser's optimized implementation of the `Set` constructor.
	* Pros:
		+ Faster execution (based on the benchmark results).
		+ Less code to write.
	* Cons:
		+ May not be as readable or maintainable for complex scenarios.
2. **Loop**: This approach is more explicit and iterative, which can be beneficial for understanding the creation process.
	* Pros:
		+ More explicit and easier to understand for complex scenarios.
		+ Can be used in situations where the `Set` constructor cannot be used (e.g., legacy browsers).
	* Cons:
		+ Slower execution compared to the Constructor approach.

**Other considerations:**

1. **Browser performance**: The benchmark results show significant differences between Chrome and other browsers, which highlights the importance of considering browser-specific optimizations when writing efficient code.
2. **Array size**: The benchmark uses an array of 1000 elements. In real-world scenarios, the size of the input data can greatly impact performance.

**What is the library?**

None. This benchmark uses native JavaScript features and does not rely on any external libraries.

**Special JS feature or syntax:**

1. **Set constructor**: The `Set` constructor is a built-in JavaScript feature that creates a new Set object from an iterable (in this case, an array).
2. **Array.prototype.fill()**: This method fills an array with a specified value and returns the filled array.
3. **Arrow functions**: These are concise function expressions used in the `map()` method to create new elements.

**Other alternatives:**

While not mentioned explicitly, alternative approaches to creating a Set from an array could include:

1. **Using a library**: Some libraries like Lodash or Underscore provide optimized implementations for creating Sets and other data structures.
2. **Iterating over the array using other methods**: Besides for loops, other iteration methods like `forEach()`, `map()`, or `reduce()` can be used to create a Set from an array.
3. **Using a more efficient algorithm**: Depending on the specific use case, alternative algorithms or data structures might offer better performance than the simple approach demonstrated in this benchmark.

I hope this explanation helps software engineers understand the trade-offs and considerations involved in creating a new Set from an array using JavaScript!

Related benchmarks:

Fill up Set from array (version: 0)

Create new set from array of data. What is faster constructor or iteration.

Comparing performance of: Constructor vs Loop

Created: 2 years ago by: Registered User

Jump to the latest result

Constructor

Loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):