Benchmark: Set Has vs Array Includes

Script Preparation code:

var array = Array.from(Array(50), (x, index) => index + 1).sort(() => 0.5 - Math.random());
var set = new Set(array);

Tests:

Array Includes
for (let i = 0; i < array.length; i++) { array.includes(i); }
Set Has
for (let i = 0; i < array.length; i++) { set.has(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array Includes
Set Has

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**What is being tested?**

The provided benchmark compares the performance of two approaches:

1. `Array.includes()` method
2. `Set.has()` method

Both methods are used to check if an element exists in a collection (an array or a set, respectively).

**Options compared:**

* **Array.includes()**: This method takes an element as an argument and returns a boolean value indicating whether the element is present in the array.
* **Set.has()**: This method takes an element as an argument and returns a boolean value indicating whether the element is present in the set.

**Pros and Cons of each approach:**

* **Array.includes():**
	+ Pros:
		- Simple and intuitive syntax
		- Efficient for small to medium-sized arrays
	+ Cons:
		- May involve linear search, leading to O(n) time complexity
		- Can be slower for large arrays due to the search operation
* **Set.has():**
	+ Pros:
		- Fast lookup time (O(1) average case)
		- Efficient for large sets or collections
	+ Cons:
		- Requires a set data structure, which may incur additional memory and initialization overhead
		- May not be suitable for all types of data (e.g., non-hashable elements)

**Library used:**

The `Array.from()` method is used to create an array from an iterable. In this benchmark, it's used to generate an array with 50 random elements.

No library is explicitly mentioned in the test cases or benchmark definition.

**Special JS feature/syntax:**

None of the provided code snippets contain any special JavaScript features or syntax that would require additional explanation.

**Other alternatives:**

If you need to check if an element exists in a collection, other alternatives could be:

* `Array.indexOf()`: Similar to `includes()`, but returns the index of the first occurrence (or -1 if not found).
* `Array.prototype.some()` or `Array.prototype.every()`: These methods can be used with callback functions to test for presence or absence of elements in an array.
* Using a different data structure, such as a Map or a Set-like object (e.g., `Map.of()`), might also provide alternative solutions.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your use case.

Related benchmarks:

Set Has vs Array Includes (version: 0)

Comparing performance of Set.has() vs Array.includes()

Comparing performance of: Array Includes vs Set Has

Created: 5 years ago by: Registered User

Jump to the latest result

Array Includes

Set Has

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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