Benchmark: set.has vs. array.includes asdfasdfasdf

Tests:

includes
const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; return a.includes(9)
lookup
const b = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) 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: 7 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser/OS: Firefox 142 on Linux

View result in a separate tab

Test name	Executions per second
includes	24797438.0 Ops/sec
lookup	4478196.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into explaining the benchmark and its results.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents two individual test cases: `includes` and `lookup`. Both tests compare the performance of different approaches for checking if an element exists in an array (for `includes`) or a Set object (for `lookup`). In this explanation, we'll focus on the second set of results.

**Benchmark Definition**

The first benchmark definition is a simple JavaScript code snippet that defines two arrays: `a` and `b`. The code then uses the `includes()` method to check if `9` exists in array `a`, and the `has()` method to check if `9` exists in Set `b`.

**Test Cases**

There are two test cases:

1. **`includes`**: This test case compares the performance of using the `includes()` method to search for an element in an array.
2. **`lookup`**: This test case compares the performance of using the `has()` method to search for an element in a Set object.

**Options Compared**

The two options compared are:

* Using `includes()` on an array
* Using `has()` on a Set object

**Pros and Cons of Each Approach:**

1. **`includes()` on an array**
	* Pros:
		+ Widely supported and well-maintained.
		+ Fast and efficient, especially for large arrays.
		+ Easy to use and understand.
	* Cons:
		+ Can be slower than using a Set object for small arrays due to the overhead of searching.
2. **`has()` on a Set object**
	* Pros:
		+ Generally faster than `includes()` for small arrays or sets, as it uses a more efficient data structure.
		+ More memory-efficient, especially for large datasets.
	* Cons:
		+ Less widely supported and not as well-maintained as `includes()`.
		+ Can be less intuitive to use for developers without experience with Sets.

**Library Used**

The `Set` object is used in the second test case. A Set is a collection of unique values that can be used to store and look up elements efficiently. It's implemented as an object in JavaScript, which means it provides fast lookup and insertion operations.

**Special JS Feature/Syntax**

There isn't any specific special feature or syntax mentioned in the benchmark definition or results.

**Other Alternatives**

If you're looking for alternative approaches to checking if an element exists in an array or Set object, some options include:

* Using `indexOf()` on an array (although this is slower than `includes()`)
* Implementing a custom binary search algorithm
* Using a library like Lodash's `findIndex()` function

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

Related benchmarks:

set.has vs. array.includes asdfasdfasdf (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>

Fastest: N/A

Slowest: N/A

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