Benchmark: Lodash "uniqWith" "unionBy" "uniqBy" 6 Custom

HTML Preparation code:

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

Script Preparation code:

var users = [
  { 'name': 'barney',  'age': 36 },
  { 'name': 'pebbles', 'age': 5 }
];

var newUsers = [
  { 'name': 'fred',    'age': 40 },
  { 'name': 'barney',  'age': 36 },
  { 'name': 'pebbles', 'age': 2 }
];

for(let i = 0; i < 2000; i++) {
  var newUser = { 'name': 'user_' + i, 'age': Math.floor(Math.random() * i) };
  newUsers.push(newUser);
}

Tests:

uniqWith
const unionUsers1 = _.uniqWith(newUsers.concat(users), _.isEqual);
unionBy
const unionUsers2 = _.unionBy(newUsers, users, 'name');
uniqBy
const unionUsers1 = _.uniqBy(newUsers.concat(users), p=> p.name + p.age);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
uniqWith
unionBy
uniqBy

Fastest: N/A

Slowest: N/A

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

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This benchmark tests the performance of three different Lodash functions: `uniqWith`, `unionBy`, and `uniqBy`, each used to deduplicate an array of user objects based on their 'name' property.

Here's a breakdown:

**Options Compared:**

* **`uniqWith`:** This function takes two arguments: the array to deduplicate and a custom comparison function (`_.isEqual` in this case). It uses the provided function to determine if elements are equal. 
* **`unionBy`:** This function merges two arrays and returns a new array with unique elements based on the specified property ('name' here).  It effectively combines the arrays without duplicates, considering the 'name' property as the identifier for uniqueness.
* **`uniqBy`:** This function takes an array and a custom comparison function (in this case, a lambda expression `p=> p.name + p.age`) to determine uniqueness.

**Pros/Cons:**

* **`uniqWith`:** Offers flexibility by allowing custom comparison logic. Can be more performant than other methods if the comparison function is optimized.
* **`unionBy`:**  Specifically designed for merging arrays while preserving order and considering a specific property for uniqueness.
* **`uniqBy`:** Simple and efficient for finding unique elements based on a single property or a combination of properties in a lambda expression.

**Library: Lodash**

Lodash is a popular JavaScript library that provides utility functions for working with arrays, objects, strings, and more.  It simplifies common tasks and offers optimized implementations compared to writing raw JavaScript code.

**Other Alternatives:**

* **Native JavaScript methods:** You could use `Set` objects or the `filter()` method with custom comparison logic to achieve similar functionality.
* **Other libraries:** Libraries like Ramda also provide functions for deduplication and array manipulation.

**Choosing the Right Method:**

The best choice depends on your specific needs:

* If you need fine-grained control over uniqueness determination, use `uniqWith`.
* If you're merging arrays and want to maintain order based on a specific property, choose `unionBy`. 
* For simple deduplication based on one or more properties, `uniqBy` is often the most efficient.

Related benchmarks:

Lodash "uniqWith" "unionBy" "uniqBy" 6 Custom (version: 0)

Comparing performance of: uniqWith vs unionBy vs uniqBy

Created: 4 years ago by: Guest

Jump to the latest result

uniqWith

unionBy

uniqBy

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):