Benchmark: Includes vs Map Has

Script Preparation code:

var a = [1, 2, 3, 4, 5];
var b = new Map([[1,1],[2,1],[3,1],[4,1],[5,1]])

Tests:

Includes
a.includes(5)
Map has
b.has(5)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Includes
Map has

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided benchmark measures the performance difference between using the `includes` method and the `has` method on a Map data structure in JavaScript.

In the `Script Preparation Code`, we see that an array `a` is created with 5 elements, and a new Map `b` is initialized with key-value pairs. The question is whether the `includes` method on the array or the `has` method on the Map is faster for checking if a specific element exists.

**Options Compared**

Two options are compared:

1. **Array `includes`**: This method checks if an element exists in the array by iterating through its elements.
2. **Map `has`**: This method directly checks if a key exists in the Map.

**Pros and Cons of Each Approach**

**Array `includes`:**

Pros:

* Widely supported across JavaScript engines
* Can be used for arrays with arbitrary data types

Cons:

* Has to iterate through all elements, which can be slow for large datasets
* May have performance overhead due to string comparison (if the element is a string)

**Map `has`:**

Pros:

* Directly checks for key existence, which can be faster than iterating through elements
* More efficient when dealing with Map sizes and keys

Cons:

* Only works on Maps; not applicable to arrays or other data structures
* May require additional overhead due to Map structure and data type check

**Other Considerations**

The choice between `includes` and `has` ultimately depends on the specific use case and requirements. If you're working with arrays, `includes` might be a more widely supported and compatible option. However, if you're working with Maps or need to optimize performance for key existence checks, `has` is likely a better choice.

**Library Usage**

In this benchmark, no libraries are explicitly mentioned, but the usage of Map objects suggests that the JavaScript engine being tested supports the built-in Map data structure.

No special JavaScript features or syntax are mentioned in this benchmark.

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 15 on iOS 15.5

View result in a separate tab

Test name	Executions per second
Includes	14155440.0 Ops/sec
Map has	19165486.0 Ops/sec

Related benchmarks:

Includes vs Map Has (version: 0)

Comparing performance of: Includes vs Map has

Created: 2 years ago by: Guest

Jump to the latest result

Includes

Map has

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):