Benchmark: lodash difference vs ES6 Set (large data set and small)

HTML Preparation code:

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

Script Preparation code:

var arr1 = [];
for(let i = 0; i < 20000; i++) {
  arr1.push('' + i);
}

var arr1a = [];
for(let i = 2000; i >= 0; i--) {
  arr1a.push('' + i);
}

var arr2 = [];
for(let i = 499; i >= 0; i--) {
  arr2.push('' + i);
}

Tests:

_difference small to large
const finalArray = _.difference(arr2, arr1)
Set/Filter small to large
const outList = new Set([...arr1]); const finalArray = arr2.filter(value => !outList.has(value));
_difference small to small
const finalArray = _.difference(arr2, arr1a)
Set/Filter small to small
const outList = new Set([...arr1a]); const finalArray = arr2.filter(value => !outList.has(value));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_difference small to large
Set/Filter small to large
_difference small to small
Set/Filter small to small

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark compares two different approaches for finding the difference between two arrays in JavaScript:

**1. Lodash's `_.difference()` method:** This approach utilizes the `_difference` function from the Lodash library. Lodash is a popular library that provides utility functions and methods to simplify common JavaScript tasks.  In this case, it's used for efficiently finding elements present in one array but not another.

**2. ES6 Set and `filter()` method:** This approach leverages built-in JavaScript features:

* **`Set`**: A data structure that stores unique values, allowing for efficient membership checking.
   * **`filter()`**:  A method that creates a new array with elements that pass a specific test.

**Let's break down the options:**

* **Lodash `_.difference()` (Pros):**
    * **Concise and Readable:** Often provides a more straightforward syntax compared to manual implementations.
    * **Potentially Faster:** Lodash is highly optimized, and its `_.difference()` function might be faster than manually implementing the logic using `Set` and `filter`.

* **Lodash `_.difference()` (Cons):**
    * **Dependency:** Requires including the Lodash library in your project, adding an extra dependency.

* **ES6 Set and `filter()` (Pros):**
    * **No External Dependencies:** Uses only built-in JavaScript features, so no need to include additional libraries.
    * **Modern Syntax:** Embraces modern JavaScript concepts like Sets.
* **ES6 Set and `filter()` (Cons):**
    * **Potentially Less Efficient:** While `Set` is efficient for membership checking, the combination with `filter` might not be as optimized as Lodash's specialized function in certain scenarios.

**Other Considerations:**

* **Data Size:** For very large arrays, the performance difference between these approaches might become more significant.  
* **Specific Use Case:** If you need other functionality provided by Lodash, using `_.difference()` might be advantageous even if the `Set/filter` approach is slightly faster for this specific task.

**Alternatives:**

* **Manual Implementation:** You could implement your own difference-finding algorithm using loops and comparisons. This gives you full control but can be less efficient than optimized libraries or built-in methods.
* **Specialized Libraries:** There might be other specialized JavaScript libraries focused on array manipulation that offer even more efficient or tailored solutions for finding differences.

**Remember:** The "best" approach often depends on the specific context of your project, including factors like performance requirements, code maintainability, and existing dependencies.

Related benchmarks:

lodash difference vs ES6 Set (large data set and small) (version: 0)

Comparing performance of: _difference small to large vs Set/Filter small to large vs _difference small to small vs Set/Filter small to small

Created: 3 years ago by: Guest

Jump to the latest result

_difference small to large

Set/Filter small to large

_difference small to small

Set/Filter small to small

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):