Benchmark: Javascript uniqueBy key vs Javascript uniqueBy stringify

Script Preparation code:

var users = [
  { 'user': 'joey',  'age': 29 },
  { 'user': 'joey',  'age': 32 },
  { 'user': 'ross',    'age': 41 },
  { 'user': 'ross',    'age': 25 },
  { 'user': 'ross',    'age': 48 },
  { 'user': 'chandler', 'age': 39 },
  { 'user': 'chandler', 'age': 12 },
  { 'user': 'chandler', 'age': 41 }
]

Tests:

Javascript uniqueBy key
const uniqueBy = (array, key) => array.filter((value, index, self) => self.findIndex((item) => item[key] === value[key]) === index); let uniqued = uniqueBy(users, 'user');
Javascript uniqueBy
function removeDuplicatesFromArray(arr) { return arr.filter((value, index, self) => index === self.findIndex(obj => JSON.stringify(obj) === JSON.stringify(value))); }

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Javascript uniqueBy key
Javascript uniqueBy

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

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Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Purpose:**
The purpose of this benchmark is to compare two approaches for removing duplicates from an array in JavaScript:

1. The first approach, `Javascript uniqueBy key`, uses the `filter()` method with a custom callback function that checks for duplicate values based on a specific key.
2. The second approach, `Javascript uniqueBy`, uses a library function (`removeDuplicatesFromArray`) that implements a similar logic to remove duplicates from an array.

**Options Compared:**

1. **Filter() Method**: This is the standard JavaScript method for creating a new array with only the elements that pass a test implemented by the user.
2. **Library Function (removeDuplicatesFromArray)**: A custom function provided in the benchmark code, which uses a similar logic to remove duplicates from an array.

**Pros and Cons of Each Approach:**

1. **Filter() Method**:
	* Pros: Fast, efficient, and widely supported across browsers.
	* Cons: May not work well for large arrays or complex data structures, as it relies on the user-provided callback function.
2. **Library Function (removeDuplicatesFromArray)**:
	* Pros: Efficient, well-optimized, and easy to use for removing duplicates from an array.
	* Cons: Requires including additional code in your project (the library function), which may not be desirable for all projects.

**Other Considerations:**

1. **Key-based filtering**: The `Javascript uniqueBy key` approach uses a key-based filtering method, which can lead to better performance when dealing with arrays containing hashable values.
2. **Stringification**: The `removeDuplicatesFromArray` library function uses stringification (converting objects to strings) as part of its duplicate detection logic.

**Library Used:**
The `removeDuplicatesFromArray` library is a custom implementation that provides an efficient way to remove duplicates from an array by comparing object values using stringification. This approach relies on the `JSON.stringify()` method, which converts JavaScript objects to strings.

**Special JS Features or Syntax:**
None are explicitly mentioned in this benchmark.

Now, let's discuss alternatives:

1. **Lodash**: A popular utility library that provides a `uniqBy` function for removing duplicates from an array based on a custom key.
2. **Underscore.js**: Another utility library that provides a `uniqWith` function, similar to Lodash's `uniqBy`.
3. **Built-in Array Methods**: Other built-in methods like `every()` and `some()` can be used in combination with the `findIndex()` method to achieve duplicate removal.
4. **Custom Iterators**: For more complex data structures or custom filtering logic, using a custom iterator might provide a better solution.

These alternatives offer varying degrees of convenience, performance, and flexibility compared to the two approaches tested in this benchmark.

Related benchmarks:

Javascript uniqueBy key vs Javascript uniqueBy stringify (version: 1)

Comparing performance of: Javascript uniqueBy key vs Javascript uniqueBy

Created: 2 years ago by: Registered User

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Javascript uniqueBy key

Javascript uniqueBy

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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