Benchmark: lodash uniqwith vs map

HTML Preparation code:


<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>

Script Preparation code:

var l = [];
for (let i = 0; i < 20; i++) {
    l.push({
      	"index": Math.floor(i / 2),
        "test": "value",
        "number": 6,
        "complex": {
            "name": "steve"
        }
    })
}

Tests:

map
const map = new Map(); for (const m of l) { map.set( m.i, m ); } return map;
uniqwith
return _.uniqWith(l, (a, b) => { return a.i === b.i; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
uniqwith

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks to compare the performance of different approaches. The provided benchmark definition includes two test cases: `uniqwith` (using Lodash's `uniqWith` function) and `map` (using a built-in JavaScript `Map` object).

**Benchmark Definition Explanation**

The benchmark definition includes two sections:

* **Script Preparation Code**: This code is executed before the test, and it initializes an array `l` with 20 objects. Each object has several properties: `index`, `test`, `number`, and `complex`. The `index` property is used to compare values later.
* **Html Preparation Code**: This code includes a link to include Lodash's JavaScript library (`lodash.min.js`) in the test environment.

**Individual Test Cases**

The benchmark definition includes two individual test cases:

1. **map**:
This test case uses a built-in JavaScript `Map` object to create a map of objects, where each key is an index and the corresponding value is the entire object.
2. **uniqwith**:
This test case uses Lodash's `uniqWith` function to remove duplicates from the array `l`, based on a comparison function that checks if two objects have the same `index` property.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks such as string manipulation, object manipulation, and functional programming. In this benchmark, `uniqWith` is used to remove duplicates from an array based on a custom comparison function.

**Comparison of Approaches**

The two approaches compared in the benchmark are:

* **map**: Using a built-in JavaScript `Map` object to create a map of objects.
* **uniqwith**: Using Lodash's `uniqWith` function to remove duplicates from an array.

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

**map**:

Pros:

* Built-in JavaScript functionality, so no additional library dependencies needed.
* Easy to implement.

Cons:

* May not be optimized for performance compared to Lodash's `uniqWith` function.

**uniqwith**:

Pros:

* Optimized for performance by using a custom comparison function.
* Can handle complex data structures and relationships between objects.

Cons:

* Requires an additional library dependency (Lodash).
* More complex implementation than the built-in JavaScript `Map` object approach.

**Other Considerations**

When choosing an approach, consider the following factors:

* Performance: If speed is critical, Lodash's `uniqWith` function may be a better choice.
* Complexity: If the data structure or relationships between objects are complex, Lodash's `uniqWith` function may be more suitable.
* Library dependencies: If you prefer to avoid additional library dependencies, the built-in JavaScript `Map` object approach may be a better choice.

**Alternatives**

Other alternatives for removing duplicates from an array include:

* Using a custom implementation with a loop and conditional statements.
* Using other libraries or frameworks that provide similar functionality (e.g., Underscore.js).
* Using data structures like a Set or a Union find algorithm to remove duplicates.

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_0_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 17 on iOS 17.0.3

View result in a separate tab

Test name	Executions per second
map	5080489.0 Ops/sec
uniqwith	8329993.0 Ops/sec

Related benchmarks:

lodash uniqwith vs map (version: 0)

Comparing performance of: map vs uniqwith

Created: one year ago by: Guest

Jump to the latest result

map

uniqwith

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):