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set array index: slice vs lodash set vs Object.assign
(version: 0)
Benchmark.js
Comparing performance of:
slice vs Object.assign vs lodash set
Created:
6 years ago
by:
Registered User
Go to the latest result
HTML Preparation code:
<script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'></script>
Tests:
slice
var index = 2; var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = [ ...array.slice(0, index), 10, ...array.slice(index + 1) ];
Object.assign
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = Object.assign([], array, {2: 10});
lodash set
var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; var output = _.set(2, 10)(array)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
slice
Object.assign
lodash set
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser/OS:
Chrome 135 on Mac OS X 10.15.7
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Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=602954" width="100%" height="500px"></iframe>
slice
15.7M/s
lodash set
1.4M/s
Object.assign
1.2M/s
View exact numbers
Test name
Executions per second
✓
slice
15,724,734 Ops/sec
lodash set
1,401,836 Ops/sec
Object.assign
1,201,796 Ops/sec
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 in each test case. The benchmark, named "set array index: slice vs lodash set vs Object.assign", compares three different approaches to set an element at a specific index in an array: 1. **Slice**: The `Array.prototype.slice()` method returns a shallow copy of a portion of an array. 2. **Lodash Set**: The Lodash library provides the `_set()` function, which sets the value of a property on an object (or an array) at a specific key (index). 3. **Object.assign()**: This method is used to add one or more source objects to an existing target object. **Options Comparison:** Here's a brief overview of each approach and their pros/cons: * **Slice:** * Pros: * Simple, straightforward implementation. * Does not require any additional libraries. * Cons: * Returns a new array, which can be slower for large arrays due to the overhead of creating a new object. * Requires extra memory allocation. * **Lodash Set:** * Pros: * Provides a more explicit and controlled way of setting values in an array or object. * Does not require manual looping or indexing. * Cons: * Adds an external dependency on the Lodash library, which can be a performance overhead. * May have additional overhead due to the complexity of the `_set()` function. * **Object.assign():** * Pros: * A well-established and widely-supported method for merging objects. * Can also be used to set values in an object or array by using the `null` value as a replacement. * Cons: * Returns the target object, not a new array, which can lead to unexpected behavior if not handled correctly. **Other Considerations:** The choice of approach depends on the specific requirements and constraints of your project. For example: * If you're working with large datasets or need to perform frequent updates, using `Array.prototype.slice()` might be the most efficient option. * If you prefer a more explicit and controlled way of setting values in an array or object, `_set()` from Lodash could be a better choice. **Library and Special JS Feature:** The Lodash library is used in one of the test cases. Lodash provides a collection of functional programming helpers that can simplify common tasks. In this case, `_set()` is used to set the value of an element at a specific index in the array. There are no special JavaScript features or syntax used in these benchmarks. They only use standard JavaScript methods and libraries like Lodash. **Alternatives:** Other alternatives for setting values in an array or object could include: * Using `Array.prototype.indexOf()` to find the index of the element, then using `Array.prototype.splice()` to replace it. * Using a custom implementation with manual looping and indexing. However, these approaches may be less efficient and more error-prone than the methods used in this benchmark.
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