Benchmark: Finding unique properties from objects

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js'></script>

Script Preparation code:

var arr = [{"id": 1, "name":"Name1", "country":"USA"}, {"id": 2, "name":"Name2", "country":"Scotland"}, {"id": 3, "name":"Name3", "country":"USA"}, {"id": 4, "name":"Name4", "country":"USA"}, {"id": 5, "name":"Name5", "country":"Scotland"}, {"id": 6, "name":"Name6", "country":"Poland"}, {"id": 7, "name":"Name7", "country":"USA"}];

Tests:

Map then create Set
return new Set(arr.map((o) => o.country));
Map then use Lodash uniq
return _.uniq(arr.map((o) => o.country));
Use Lodash then map
return _.uniqBy(arr, 'country').map((o) => o.country);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map then create Set
Map then use Lodash uniq
Use Lodash then map

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the provided JSON data and explain what is tested, the options compared, pros and cons of those approaches, and other considerations.

**Benchmark Definition**

The benchmark tests finding unique properties from an array of objects. The script preparation code defines an array `arr` containing six objects with a "country" property each. The html preparation code includes a reference to Lodash library (`lodash.min.js`) which will be used in the benchmark test cases.

**Test Cases**

There are three individual test cases:

1. **Map then create Set**: This approach maps each object in the `arr` array to its "country" property using `map()`, and then creates a new set from the resulting array using `Set()`.
2. **Map then use Lodash uniq**: This approach uses the `uniq()` function from Lodash library to find unique values in the mapped array.
3. **Use Lodash then map**: This approach first uses the `uniqBy()` function from Lodash library to find unique objects based on their "country" property, and then maps each object to its "country" property.

**Options Compared**

The three test cases compare different approaches to finding unique properties:

* Creating a set directly from the mapped array (Map then create Set)
* Using `uniq()` function from Lodash library
* First using `uniqBy()` function from Lodash library and then mapping each object to its "country" property

**Pros and Cons**

Here's a brief analysis of the pros and cons of each approach:

1. **Map then create Set**:
	* Pros: Simple, efficient, and lightweight.
	* Cons: May have higher overhead due to set creation and comparison operations.
2. **Map then use Lodash uniq**:
	* Pros: Uses optimized Lodash function for uniqueness detection.
	* Cons: Adds an external dependency (Lodash) and may introduce performance overhead due to library call.
3. **Use Lodash then map**:
	* Pros: Allows for more control over uniqueness detection using `uniqBy()` function.
	* Cons: May have higher overhead due to additional Lodash function calls.

**Other Considerations**

* The benchmark uses a relatively small input array, which may not accurately represent the performance characteristics of these approaches with larger datasets.
* The use of Lodash library introduces an external dependency and may affect the test's overall execution time.
* The benchmark is run on Firefox 89 browser on a desktop platform, so results may not be directly applicable to other browsers or platforms.

**Alternatives**

Other alternatives could include:

1. Using `Set` constructor with array comprehension: `new Set([o.country for o in arr])`
2. Using `Filter()` and `Reduce()` functions from Lodash library
3. Implementing a custom uniqueness detection function using Array.prototype.filter() and Set data structure.

However, these alternatives may not be as efficient or optimized as the original approaches tested by MeasureThat.net.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0

Browser/OS: Firefox 89 on Ubuntu

View result in a separate tab

Test name	Executions per second
Map then create Set	1413507.4 Ops/sec
Map then use Lodash uniq	3979639.8 Ops/sec
Use Lodash then map	2545208.0 Ops/sec

Related benchmarks:

Finding unique properties from objects (version: 0)

Find fastest way to fetch unique properties from array of objects

Comparing performance of: Map then create Set vs Map then use Lodash uniq vs Use Lodash then map

Created: 3 years ago by: Guest

Jump to the latest result

Map then create Set

Map then use Lodash uniq

Use Lodash then map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):