Benchmark: lodash differenceby vs sort2

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js'></script>

Script Preparation code:

var values = Array(10000).fill(null).map((x, a) => ({number: a}));
var values2 = Array(10000).fill(null).map((x, a) => ({number: 10000-a}));

Tests:

sort
const result = _.isEqual(values.sort(), values2.sort()) console.log(result)
differenceBy
const result = _.differenceBy(values, values2, _.isEqual)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
sort
differenceBy

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 YaBrowser/25.2.0.0 Safari/537.36

Browser/OS: Yandex Browser 25 on Windows

View result in a separate tab

Test name	Executions per second
sort	1560.1 Ops/sec
differenceBy	2849.8 Ops/sec

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 various components.

**Benchmark Overview**

The benchmark compares the performance of two functions from the Lodash library: `_.isEqual` (which checks for deep equality) and `_.differenceBy`. The goal is to determine which function is faster when applied to two large arrays with unique elements.

**Options Compared**

There are two options being compared:

1. **_.isEqual(values.sort(), values2.sort())**: This option sorts both arrays before comparing them using the `.isEqual` function. Sorting has a time complexity of O(n log n), so this approach may be slower for large datasets.
2. **_.differenceBy(values, values2, _.isEqual)**: This option uses the `_.differenceBy` function to remove elements from the first array (`values`) that exist in the second array (`values2`). The callback function provided to `_.differenceBy` is set to `_.isEqual`, which checks for deep equality. This approach may be faster than sorting because it avoids the overhead of sorting.

**Pros and Cons**

* **Sorting**: Pros: allows for a simple comparison of two arrays in sorted order. Cons: can be slow for large datasets due to its time complexity (O(n log n)).
* **_.differenceBy**: Pros: potentially faster than sorting, as it avoids the overhead of sorting. Cons: requires more complex logic and may not always produce the expected results if the callback function is not correctly implemented.

**Library and Purpose**

The Lodash library provides a set of utility functions for functional programming in JavaScript. The `_.isEqual` function checks whether two values are equal, considering both value and reference equality. In this benchmark, it's used to compare arrays after sorting or removing elements using `_.differenceBy`.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark.

**Other Alternatives**

If the goal of the benchmark were different, other approaches might be explored:

* Instead of sorting both arrays, one array could be sorted and the other left unsorted to see if there's a significant difference.
* Alternative comparison functions could be used instead of `_.isEqual`, such as `_.equal` or `_.deepEqual`.
* Different data structures, like linked lists or trees, could be used instead of arrays.

Overall, this benchmark provides a useful comparison between two common array manipulation operations in JavaScript: sorting and using `_.differenceBy`.

Related benchmarks:

lodash differenceby vs sort2 (version: 0)

Comparing performance of: sort vs differenceBy

Created: 4 years ago by: Guest

Jump to the latest result

sort

differenceBy

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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