Benchmark: Lodash vs. Set Intersection (1000000)

HTML Preparation code:

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

Script Preparation code:

var first = [];
var second = [];
for(i=0; i<1000000; i++){ 
  first[i] = ''+i;
  second[i] = ''+0;
}

Tests:

Javascript Set intersection
const secondSet = new Set(second); first.filter(item => secondSet.has(item));
Lodash intersection
_.intersection(first, second)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Javascript Set intersection
Lodash intersection

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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**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark, which is a small piece of code designed to measure the performance of different algorithms or implementations on various hardware configurations.

**Test Case 1: Javascript Set Intersection**

In this test case, two arrays (`first` and `second`) are created with 1 million elements each. The first array contains strings representing numbers (e.g., `'0'`, `'1'`, etc.), while the second array contains only zeros (`''+0`). The task is to find the intersection of these two sets, i.e., the elements that are common in both arrays.

**Test Case 2: Lodash Intersection**

This test case uses the `lodash` library, which provides a utility function called `intersection()` for finding the intersection of arrays. The same two arrays (`first` and `second`) are used as in Test Case 1.

**Options Compared**

In both test cases, the following options are compared:

* **Naive approach**: Using a simple loop to iterate through the elements of one array and checking if each element exists in the other array using the `has()` method or the `in` operator.
* **Lodash intersection**: Using the `intersection()` function from the `lodash` library to find the common elements between the two arrays.

**Pros and Cons**

* **Naive approach**:
	+ Pros: Simple to implement, easy to understand.
	+ Cons: Can be slow for large datasets due to the linear search.
* **Lodash intersection**:
	+ Pros: Faster than the naive approach, especially for large datasets, since it uses a more efficient data structure (a `Set`) under the hood.
	+ Cons: Requires an additional library (`lodash`), which may not be suitable for all projects or environments.

**Library and Purpose**

The `lodash` library is a popular JavaScript utility library that provides a wide range of functions for tasks such as array manipulation, string manipulation, and more. In this case, the `intersection()` function is used to find the common elements between two arrays. Lodash aims to provide a fast and efficient way to perform these operations, making it a useful tool for developers who need to work with data in various formats.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The code is straightforward and uses only basic JavaScript constructs.

**Other Alternatives**

If you're interested in alternative approaches to set intersection, here are some options:

* Using the `filter()` method with a callback function that checks for membership in the other array.
* Utilizing a data structure like a `Map` or a `Set` to store the elements of one array and then checking if each element exists in the other array.

Here's an example implementation using a `Map`:
```javascript
const map = new Map();
for (let i = 0; i < first.length; i++) {
  map.set(first[i], true);
}
const intersection = [];
for (let i = 0; i < second.length; i++) {
  if (map.has(second[i])) {
    intersection.push(second[i]);
  }
}
```
This approach has a similar time complexity to the Lodash `intersection()` function but uses more memory due to the creation of a `Map`.

Related benchmarks:

Lodash vs. Set Intersection (1000000) (version: 0)

Comparing performance of: Javascript Set intersection vs Lodash intersection

Created: 4 years ago by: Guest

Jump to the latest result

Javascript Set intersection

Lodash intersection

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):