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

Latest run results:

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

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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.

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: 4 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>

Fastest: N/A

Slowest: N/A

No previous run results

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