Benchmark: Lodash Difference vs Set.delete 2

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.17.0/lodash.min.js"></script>

Script Preparation code:

var arr1=[]; 
var i;
for(i=0; i<1000000; i++){
	arr1.push(i);
}

var arr2=[]; 
for(i=0; i<1000000; i++){
	arr2.push(1000000-i);
}

Tests:

Lodash Difference
_.difference(arr1,arr2)
Set.delete() worstCase
const set1 = new Set(arr1); arr2.forEach(v => set1.delete(v))
Set.delete() bestCase
const set1 = new Set(arr1); var arr3=[]; for(i=0; i<1000000; i++){ arr3.push(0); } arr3.forEach(v => set1.delete(v))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash Difference
Set.delete() worstCase
Set.delete() bestCase

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its options.

**Benchmark Overview**

The benchmark measures the performance of two approaches to find the difference between two arrays:

1. Using Lodash's `difference` function
2. Using the `Set.delete()` method with an array as a set

**Lodash Difference Function**

The `difference` function is used in the first test case. It takes two arrays as input and returns a new array containing only the elements that are present in the first array but not in the second.

Pros:

* Easy to use: Just pass the two arrays to the function.
* Efficient implementation: Lodash's `difference` function uses an efficient algorithm under the hood.

Cons:

* External dependency: The benchmark requires the Lodash library to be included, which can add overhead.
* Potential performance impact: Depending on the version of Lodash and the JavaScript engine used, there might be some performance overhead due to the external library.

**Set.delete() Method**

The `Set.delete()` method is used in two test cases. It takes an element as input and removes it from the set if it exists.

Pros:

* No external dependencies: This approach only uses built-in JavaScript methods.
* Potential for better performance: In some cases, the `Set.delete()` method can be faster than using an array-based implementation like Lodash's `difference`.

Cons:

* Less readable code: The test case requires a slightly more complex setup to create and populate the set.
* Potential for false positives or negatives: Depending on the JavaScript engine used, there might be some variability in performance due to caching or other factors.

**Best-Case vs Worst-Case Scenarios**

The two test cases differ in how the array is populated:

* Best-case scenario: The array contains only zeros (i.e., `arr3`).
* Worst-case scenario: The array contains non-zero values (i.e., `arr1` and `arr2`).

In the best-case scenario, the `Set.delete()` method is expected to be faster because it can take advantage of the set's internal data structure. In the worst-case scenario, both approaches are likely to have similar performance due to the random distribution of values in the array.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for common tasks, including array manipulation. The `difference` function is one of its most useful features.

**Special JS Feature/Syntax: None**

There are no special JavaScript features or syntax used in this benchmark.

**Alternatives**

If you want to implement an alternative approach to find the difference between two arrays, some options include:

* Using a custom implementation with bitwise operations (e.g., using `Array.prototype.indexOf()` and `Array.prototype.slice()`)
* Using a different library like underscore.js (which provides similar functionality to Lodash)
* Implementing the solution using only built-in JavaScript methods, without relying on external libraries.

Related benchmarks:

Lodash Difference vs Set.delete 2 (version: 0)

Comparing performance of: Lodash Difference vs Set.delete() worstCase vs Set.delete() bestCase

Created: 6 years ago by: Guest

Jump to the latest result

Lodash Difference

Set.delete() worstCase

Set.delete() bestCase

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):