Benchmark: Lodash: difference vs intersection22

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var arrFull = _.range(1, 1000000);
var arrOne = _.range(1, 100000);

Tests:

Difference - Full
_.difference(arrFull, arrFull)
Intersection - Full
_.intersection(arrFull, arrFull)
Difference - Partial
_.difference(arrFull, arrOne)
Intersection - Partial
_.intersection(arrOne, arrFull)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Difference - Full
Intersection - Full
Difference - Partial
Intersection - Partial

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's dive into the details of this benchmark.

**What is being tested?**

This benchmark compares two array operations using the `lodash` library: `_difference` and `_intersection`. These functions are designed to find elements that are present in one array but not in another, or common elements between two arrays, respectively.

The test cases involve creating two large arrays (`arrFull`) with a million elements each and a smaller array (`arrOne`) with 100,000 elements. The benchmark measures the execution time of these functions for four scenarios:

1. `_difference(arrFull, arrFull)`: finding differences in an array against itself (basically a no-op).
2. `_intersection(arrFull, arrFull)`: finding common elements between two identical arrays.
3. `_difference(arrFull, arrOne)`: finding differences between a large and a small array.
4. `_intersection(arrOne, arrFull)`: finding common elements between a small and a large array.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks like data manipulation, function composition, and more. In this benchmark, the `lodash` library is used to provide the `_difference` and `_intersection` functions.

These functions are implemented using optimized algorithms, making them efficient for large datasets. The benchmark uses the `lodash.min.js` version 4.16.0, which is a compact implementation of the library.

**JavaScript feature: None**

There's no special JavaScript feature or syntax used in this benchmark. The test cases simply use the provided `lodash` functions to perform array operations.

**Pros and Cons of different approaches**

The two functions being compared are:

1. `_difference`: This function is efficient when finding differences between large arrays, as it uses a optimized algorithm.
2. `_intersection`: This function is also efficient for finding common elements between large arrays, but its performance degrades slightly when dealing with smaller arrays.

Based on the benchmark results, it appears that `_difference` performs better than `_intersection` in all scenarios. This suggests that `_difference` might be a more efficient choice when working with large datasets or finding differences between them.

**Other considerations**

The benchmark is run on a Chrome 80 browser on a Linux desktop platform, which gives us an idea of the performance characteristics on this specific environment. However, the results should still provide useful insights for developers using other browsers or platforms.

**Alternatives**

If you don't want to use `lodash`, you can implement your own `_difference` and `_intersection` functions using standard JavaScript array methods like `filter()`, `map()`, and `includes()`. However, keep in mind that these implementations might not be as efficient as the optimized algorithms provided by `lodash`.

Another alternative is to use other library or framework-specific array operations, such as those provided by jQuery or React.

Related benchmarks:

Lodash: difference vs intersection22 (version: 0)

Comparing performance of: Difference - Full vs Intersection - Full vs Difference - Partial vs Intersection - Partial

Created: 6 years ago by: Guest

Jump to the latest result

Difference - Full

Intersection - Full

Difference - Partial

Intersection - Partial

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):