Benchmark: Set x includes x _.uniqBy

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var arr = ["aaa", "bbb", "aaa", "ccc", "bbb"];

Tests:

set
var set = new Set(arr); set.has("aaa");
includes
arr.includes("aaa");
uniqby
_.uniqBy(arr, "aaa");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
set
includes
uniqby

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark JSON and explain what's being tested.

**Benchmark Overview**

The test suite consists of three individual test cases, each measuring the performance of a specific JavaScript operation:

1. `set`: Creating a new Set instance from an array and checking if an element is present in it using the `has()` method.
2. `includes`: Checking if an element is present in an array using the `includes()` method.
3. `uniqBy`: Removing duplicate elements from an array based on a specified property using Lodash's `uniqBy()` function.

**Options Compared**

The benchmark tests different approaches to achieve the same result:

* For `set`, two options are compared:
	+ Creating a new Set instance and checking if an element is present in it (`set.has("aaa";`).
	+ Using the `includes()` method on the original array (`arr.includes("aaa");`).
* For `uniqBy`, one option is compared:
	+ Using Lodash's `uniqBy()` function to remove duplicates based on a specified property (`_.uniqBy(arr, "aaa");`).

**Pros and Cons of Each Approach**

1. **Set**:
	+ Creating a new Set instance:
		- Pros: Fast lookup times (O(1)) and efficient for large datasets.
		- Cons: Requires an additional object creation and potentially more memory usage.
	+ Using `includes()` on the original array:
		- Pros: More familiar and convenient syntax, no additional object creation required.
		- Cons: Slower lookup times (O(n)), less efficient for large datasets.
2. **UniqBy**:
	+ Using Lodash's `uniqBy()` function:
		- Pros: Convenient and concise syntax, handles edge cases well.
		- Cons: Requires an external library dependency (Lodash), potentially slower than native implementations.

**Other Considerations**

* For the `set` test case, it's worth noting that some JavaScript engines may optimize the `has()` method to use a similar approach as the `includes()` method when dealing with arrays. However, this optimization is not always guaranteed and can vary between browsers.
* The `uniqBy()` function uses a combination of sorting and iterating over the array to remove duplicates. This approach can be effective but might introduce additional overhead due to the sorting step.

**Library: Lodash**

Lodash is a popular JavaScript library that provides a wide range of utility functions, including the `uniqBy()` function used in this benchmark. The library aims to provide convenient and concise solutions for common programming tasks, often sacrificing performance for ease of use.

**Special JS Feature/Syntax**

None of the provided test cases employ any special or exotic JavaScript features or syntax. They focus on demonstrating the performance differences between three basic operations: creating a Set instance, using `includes()` on an array, and removing duplicates from an array using Lodash's `uniqBy()` function.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

Browser/OS: Chrome 86 on Mac OS X 10.15.3

View result in a separate tab

Test name	Executions per second
set	2285667.2 Ops/sec
includes	9289949.0 Ops/sec
uniqby	1769597.5 Ops/sec

Related benchmarks:

Set x includes x _.uniqBy (version: 0)

Comparing performance of: set vs includes vs uniqby

Created: 3 years ago by: Guest

Jump to the latest result

set

includes

uniqby

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):