Benchmark: lodash uniq vs native uniq

HTML Preparation code:

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

Script Preparation code:

var obj = [1, 2, 3, 4, 6, 6, 4, 1, 2, 2, 3];

Tests:

native uniq
let u = new Set(obj);
ld uniq
let u = _.uniq(obj);

Historical Performance Data aggregated from 25 community runs

Desktop Results:

Chrome 25 runs

ld uniq

15.3M/s

native uniq

6.8M/s

Fastest: ld uniq (2.2x faster)

View exact numbers

✓ ld uniq: 15,301,202 ops/sec
• native uniq: 6,834,111 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
native uniq
ld uniq

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36

Browser/OS: Chrome 151 on Mac OS X 10.15.7

View result in a separate tab

ld uniq

26.7M/s

native uniq

12.1M/s

View exact numbers

Test name	Executions per second
✓ ld uniq	26,719,288 Ops/sec
native uniq	12,128,976 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the provided benchmark and its options.

**What is tested on the provided JSON?**

The JSON represents a JavaScript microbenchmark that compares the performance of two approaches: using the native `Set` data structure (also known as "native uniq") and using the `_uniq` function from the Lodash library. The test case generates an array of duplicate values (`obj`) and measures how many unique elements can be extracted from it using both methods.

**Options compared**

There are two options being compared:

1. **Native uniq**: This approach uses the native `Set` data structure to extract unique elements from the input array. A `Set` is a collection of unique values that cannot have duplicate entries.
2. **Lodash uniq**: This approach uses the `_uniq` function from the Lodash library to extract unique elements from the input array.

**Pros and Cons**

**Native uniq:**

Pros:

* Native implementation, so it's likely to be highly optimized for performance.
* No additional library dependencies required.

Cons:

* May not support all types of data (e.g., non-numeric values).
* Can be slower than a specialized library implementation if the input size is large.

**Lodash uniq:**

Pros:

* Supports all types of data (e.g., non-numeric values).
* Often faster than native implementations for large input sizes.
* Provides additional features, such as preserving order or handling null/undefined values.

Cons:

* Requires an external library dependency.
* May have overhead due to the library's initialization and loading processes.

**Other considerations**

The benchmark also considers other factors, such as:

* **DevicePlatform** and **OperatingSystem**: These are reported by the browser during execution and can affect performance. The benchmark assumes a Desktop platform on Windows.
* **ExecutionsPerSecond**: This measures how many unique elements can be extracted from the input array per second.

**Library and syntax**

In this case, the Lodash library is used to implement the `_uniq` function. The `Set` data structure is a native JavaScript implementation that's used as an alternative for comparison.

There are no special JavaScript features or syntaxes being tested in this benchmark.

**Alternatives**

Other alternatives to compare unique elements could include:

* Using a different library, such as jQuery's `unique()` function.
* Implementing the uniqueness test using only basic arithmetic operations (e.g., iterating through the array and keeping track of unique values).
* Using a more specialized data structure, like a Bloom filter or a trie.

However, these alternatives may not provide comparable performance to the native implementation or Lodash implementation, which are optimized for specific use cases.

lodash uniq vs native uniq (version: 0) Benchmark.js

Comparing performance of: `native uniq vs ld uniq`

Created: 6 years ago by: Guest

Go to the latest result

native uniq

ld uniq

Historical Performance Data aggregated from 25 community runs

Desktop Results:

Chrome 25 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

lodash uniq vs native uniq (version: 0) Benchmark.js

Comparing performance of: native uniq vs ld uniq

Created: 6 years ago by: Guest

Go to the latest result

native uniq

ld uniq

Historical Performance Data aggregated from 25 community runs

Desktop Results:

Chrome 25 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `native uniq vs ld uniq`