Benchmark: lodash UniqueWith vs custom filter

Script Preparation code:

var myArray = Array(3000).fill({a:1, b:2});

Tests:

_.uniqWith
myArray = _.uniqWith(myArray, _.isEqual);
filter
const trackObj = {}; myArray = myArray.filter(item => { if (trackObj[item.a] && trackObj[item.a] === item.b) { return false; } trackObj[item.a] = item.b; return true; })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.uniqWith
filter

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 break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to remove duplicates from an array while preserving equality between objects. The goal is to determine which approach is faster.

**Options Compared**

There are two options compared in this benchmark:

1. **Lodash `uniqWith`**: This function uses a custom equality function (`_.isEqual`) to compare objects and remove duplicates.
2. **Custom Filter**: This approach uses a filter function with a conditional statement to check for duplicate objects and return `false` if the comparison fails.

**Pros and Cons of Each Approach**

1. **Lodash `uniqWith`**:
	* Pros: Encapsulates the equality logic in a reusable and flexible way, reducing code duplication.
	* Cons: May incur additional overhead due to the use of an external library (Lodash).
2. **Custom Filter**:
	* Pros: No external dependencies, easy to understand and maintain.
	* Cons: Requires custom implementation of the equality logic, which may lead to mistakes or inconsistencies.

**Library Used**

The Lodash library is used in this benchmark for its `uniqWith` function, which provides a convenient way to remove duplicates while preserving equality between objects. The `_.isEqual` function is used as the custom equality function to compare objects.

**Special JavaScript Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark beyond what's required to test the two approaches. No async/await, Promises, or other advanced concepts are utilized.

**Other Alternatives**

If you're interested in exploring alternative approaches for removing duplicates from an array while preserving equality between objects, here are a few options:

* Using `Set` and `JSON.stringify()` to create a set of unique object representations.
* Implementing a custom hash function to generate unique hashes for each object.
* Utilizing a data structure like a trie or a suffix tree to efficiently store and retrieve unique values.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the Lodash `uniqWith` and custom filter approaches.

Related benchmarks:

lodash UniqueWith vs custom filter (version: 0)

Comparing performance of: _.uniqWith vs filter

Created: 3 years ago by: Guest

Jump to the latest result

_.uniqWith

filter

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):