Benchmark: Lodash Uniq vs Javascript Set

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.5/lodash.min.js"></script>

Script Preparation code:

var firstEqual = [];
var secondEqual = [];

for (var i=0; i<=10000000; i++) {
  firstEqual.push(i);
  secondEqual.push(i);
}

var arrayToDedup = [...firstEqual, ...secondEqual];

Tests:

Lodash Uniq
_.uniq(arrayToDedup);
Javascript Set
[...new Set(arrayToDedup)]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash Uniq
Javascript Set

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The benchmark compares two approaches to remove duplicate elements from an array: using the `lodash uniq` function and creating a new Set object.

**Options Compared**

1. **Lodash Uniq**: This method uses the `_.uniq` function from the Lodash library, which is a utility library for functional programming in JavaScript.
2. **JavaScript Set**: This approach uses the built-in `Set` data structure in JavaScript to remove duplicates. A Set is an unordered collection of unique values.

**Pros and Cons**

**Lodash Uniq**

Pros:

* Fast execution time due to optimized implementation
* Handles edge cases like NaN or null values
* Provides a consistent and predictable output

Cons:

* Requires including the Lodash library, which adds extra overhead
* May not be suitable for small datasets due to its performance optimization
* Not as efficient as the JavaScript Set approach for very large datasets

**JavaScript Set**

Pros:

* Fast execution time, especially for large datasets
* Does not require any additional libraries or dependencies
* Scalable and efficient

Cons:

* Can be slower than Lodash Uniq for small datasets due to overhead of creating a Set object
* May return incorrect results if the array contains non-numeric values (NaN or null)

**Library and Purpose**

The `lodash uniq` function is a utility function that removes duplicate elements from an array. It returns a new array with unique elements, preserving the original order.

**Special JS Feature or Syntax**

None mentioned in this benchmark.

**Other Considerations**

* The use of `var` instead of `let` or `const` for variable declarations may lead to issues with hoisting and scope.
* The use of `push` to add elements to an array is not the most efficient approach. Using `splice` or `unshift` might be faster, but it's not shown in this benchmark.

**Alternatives**

Other approaches to remove duplicates from an array include:

1. **Splice**: Use `splice` method to remove duplicate elements by index.
2. **Slice and Filter**: Create a new array using `slice` and filter out duplicates using `filter`.
3. **Array Comprehension**: Use arrow functions and the spread operator (`...`) to create a new array with unique elements.

It's worth noting that the choice of approach depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

Lodash Uniq vs Javascript Set (version: 0)

Comparing performance of: Lodash Uniq vs Javascript Set

Created: 3 years ago by: Guest

Jump to the latest result

Lodash Uniq

Javascript Set

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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