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lodash uniq vs native uniqoififie3f02i409rfi23k
(version: 0)
Comparing performance of:
native uniq vs ld uniq
Created:
3 years ago
by:
Registered User
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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 = obj.filter((elem, ind, arr)=>arr.indexOf(elem) === ind)
ld uniq
let u = _.uniq(obj);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
native uniq
ld uniq
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided benchmark measures the performance of two approaches to remove duplicates from an array: the native `Array.prototype.filter()` method and the Lodash library's `uniq()` function. **Script Preparation Code** The script preparation code creates a sample array `obj` with duplicate elements: ```javascript var obj = [1, 2, 3, 4, 6, 6, 4, 1, 2, 2, 3]; ``` This array is used to test the performance of both approaches. **Html Preparation Code** The HTML preparation code includes a reference to the Lodash library, which is required for the `uniq()` function: ```html <script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script> ``` This library provides the `uniq()` function that will be compared to the native approach. **Benchmark Definition** The benchmark definition consists of two test cases: 1. **Native uniq**: This test case uses the native `Array.prototype.filter()` method to remove duplicates from the `obj` array. ```javascript let u = obj.filter((elem, ind, arr)=>arr.indexOf(elem) === ind); ``` 2. **Ld uniq**: This test case uses the Lodash library's `uniq()` function to remove duplicates from the `obj` array. ```javascript let u = _.uniq(obj); ``` **Approaches Comparison** The two approaches have different performance characteristics: * **Native uniq**: The native approach uses a simple filtering algorithm that iterates over the array and checks for duplicate elements. This approach has a time complexity of O(n^2), where n is the length of the array. * **Ld uniq**: The Lodash library's `uniq()` function uses a more efficient algorithm called "stable sort" to remove duplicates. This approach has a time complexity of O(n log n). **Pros and Cons** * **Native uniq**: + Pros: No additional dependencies, easy to understand. + Cons: O(n^2) time complexity, may be slower for large arrays. * **Ld uniq**: + Pros: More efficient algorithm (O(n log n)), widely supported library. + Cons: Additional dependency on Lodash library. **Library and Its Purpose** The Lodash library is a popular utility library that provides a wide range of functions for common tasks, such as array manipulation, string manipulation, and more. The `uniq()` function is specifically designed to remove duplicates from an array while preserving the original order. **Special JS Feature or Syntax** None of the provided benchmark code uses any special JavaScript features or syntax beyond standard ES6 syntax. **Alternatives** Other alternatives for removing duplicates from an array include: * Using a hash table (e.g., `Map`) to keep track of unique elements. * Using a more advanced algorithm like "bucket sort" or "counting sort". * Using a different library, such as Moment.js or Immutable.js. However, the Lodash library's `uniq()` function is widely supported and easy to use, making it a popular choice for many developers.
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