Benchmark: set.has vs. array.includes 2333

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

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its various components.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark test case for measuring the performance difference between two approaches: `set.has` and `array.includes`. The benchmark is designed to compare the execution time of these two methods on an array of 10 elements.

Here's what's being tested:

* `set.has`: This method checks if an element exists in a Set object.
* `array.includes`: This method returns a boolean value indicating whether an element exists in an array.

**Options Compared**

The benchmark compares the performance of `set.has` and `array.includes` on a specific input: an array containing 10 elements from '1' to '10', and a Set object created from this array.

**Pros and Cons**

* **set.has**:
	+ Pros: More efficient for large datasets, as it uses a hash table under the hood, allowing for faster lookups.
	+ Cons: May be slower for small datasets or single-element checks due to the overhead of creating and manipulating a Set object.
* **array.includes**:
	+ Pros: Suitable for most use cases, including small datasets and single-element checks, as it's a simple and well-optimized method.
	+ Cons: May be slower for large datasets due to the linear search algorithm used.

In general, `set.has` is a good choice when working with large datasets or needing fast lookup performance. On the other hand, `array.includes` is a more versatile option that works well for most use cases.

**Library and Special JS Features**

* **Set object**: The Set object is a built-in JavaScript data structure introduced in ECMAScript 2015 (ES6). It's designed to provide fast and efficient membership testing.
* **No special JS features or syntax are used in this benchmark.**

**Other Alternatives**

If you're looking for alternative methods, consider the following:

* `array.indexOf()` or `array.lastIndexOf()`: These methods return the index of the first occurrence of an element, which can be slower than `array.includes`.
* `Binary Search**: For large datasets, a binary search algorithm can provide faster lookup performance. However, this requires sorting the data first, which may not be necessary for small to medium-sized datasets.
* Custom implementation: Depending on your specific use case, you might consider implementing your own optimized lookup method.

Keep in mind that these alternatives may have different trade-offs and requirements, so it's essential to evaluate their suitability based on your specific needs.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Browser/OS: Chrome 107 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
includes	15380431.0 Ops/sec
lookup	15330682.0 Ops/sec

Related benchmarks:

set.has vs. array.includes 2333 (version: 0)

Comparing performance of: includes vs lookup

Created: one year 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 one month ago):