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Array immutable union: lodash union vs object.assign vs unique
(version: 0)
Comparing performance of:
lodash union vs lodash uniq spread
Created:
5 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Tests:
lodash union
var a = [ 'a', 'b', 'c', 'b', 'd', 'a', 'e', 'f' ]; var b = [ 'b', 'd', 'a', 'e', 'f' ]; var c = _.union(a);
lodash uniq spread
var a = [ 'a', 'b', 'c', 'b', 'd', 'a', 'e', 'f' ]; var b = [ 'b', 'd', 'a', 'e', 'f' ]; var c = _.uniq(a);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
lodash union
lodash uniq spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON data and explain what is being tested. **Benchmark Overview** The benchmark measures the performance of three different approaches to merge two arrays in JavaScript: using `_.union` from Lodash, `object.assign()`, and creating a new array with unique elements using `_.uniq()` followed by spreading the original array (`_.spread()`). **Options Compared** 1. **Lodash Union**: This method uses the `_` object's `union()` function to merge two arrays into a single array without duplicates. 2. **Object Assign**: This method uses the `object.assign()` method to create a new object with the merged arrays as properties. 3. **Unique Spread**: This method first uses Lodash's `_.uniq()` function to remove duplicates from one of the arrays, then spreads the original array using the spread operator (`...`) to merge it with the other array. **Pros and Cons** * **Lodash Union**: * Pros: Efficient way to merge two arrays without duplicates. * Cons: Requires Lodash library to be included in the test environment. * **Object Assign**: * Pros: Simple and straightforward approach, doesn't require any additional libraries. * Cons: Creates a new object with merged properties, which may not be efficient for large arrays. * **Unique Spread**: * Pros: Easy to implement and doesn't require Lodash library. * Cons: May have performance issues if the original array is very large, as it needs to create an intermediate array with unique elements. **Lodash Libraries** 1. **_.union()**: This function merges two arrays into a single array without duplicates. It uses a Set data structure internally to efficiently remove duplicates. 2. **_.uniq()**: This function removes duplicate elements from an array and returns a new array with unique elements. The spread operator (`...`) is used to merge the original array with the unique array. **Special JavaScript Features/Syntax** None mentioned in the provided benchmark JSON data. **Other Alternatives** If you're interested in exploring other approaches, here are some additional options: 1. **Array.prototype.concat()**: This method merges two arrays into a single array. 2. **Array.prototype.push() + Array.prototype.indexOf()**: You can use `push()` to add elements to the end of one array and then use `indexOf()` to check if an element exists in that array, effectively removing duplicates. 3. **Set data structure**: If you're comfortable with working with Sets, you can convert both arrays into Set objects, merge them using `Set.prototype.union()`, and then convert the result back to an array. Keep in mind that these alternatives might have different performance characteristics compared to the approaches mentioned in the benchmark.
Related benchmarks:
Array Properties Merge: Lodash merge vs Object.assign
Array immutable union: lodash union vs flatten and creating a new set
Array immutable union: set from lodash union vs set from lodash flatten
lodash assign vs object.assign vs spread operator - variable and constant
Lodash.assign vs Object.assign vs spread assign
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