Benchmark: set.has vs. array.includes

Script Preparation code:

var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var b = new Set(a)

Tests:

includes
return a.includes(9)
lookup
return b.has(9)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
includes
lookup

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 131 on Android

View result in a separate tab

Test name	Executions per second
includes	53447548.0 Ops/sec
lookup	99153680.0 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 benchmark and its test cases.

**Benchmark Overview**

The benchmark is comparing two approaches: `set.has` vs. `array.includes`. The goal is to measure which approach is faster for searching an element in a set or array.

**Options Compared**

The two options being compared are:

1. **Set Has**: This method uses the `has` method of a Set data structure, which returns a boolean value indicating whether the specified element exists in the set.
2. **Array Includes**: This method uses the `includes` method of an Array data structure, which returns a boolean value indicating whether the specified element exists in the array.

**Pros and Cons**

* **Set Has**: Pros:
	+ Efficient for searching unique elements (e.g., no duplicates).
	+ Fast lookup time due to hash table implementation.
Cons:
	+ May not work well for large datasets or arrays with many duplicate elements.
* **Array Includes**: Pros:
	+ Works well for large datasets and arrays with many duplicate elements.
	+ More intuitive syntax than Set Has.
Cons:
	+ Slow lookup time compared to Set Has due to linear search.

**Library and Purpose**

In the benchmark, a Set library is used. A Set is a data structure that stores unique elements in a hash table format. The `has` method of a Set allows for fast lookup of an element by its value.

**Special JS Feature or Syntax (None)**

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Other Alternatives**

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

1. **Map Lookup**: Similar to Set Has, but uses the `has` method of a Map data structure.
2. **Array Binary Search**: An alternative approach to Array Includes that uses binary search for faster lookup times.

Keep in mind that this benchmark is likely designed to test the performance of searching an element in a set or array, which may have different use cases and optimizations compared to other JavaScript scenarios.

Related benchmarks:

set.has vs. array.includes (version: 0)

Comparing performance of: includes vs lookup

Created: 4 years ago by: Guest

Jump to the latest result

includes

lookup

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):