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immvsospread
(version: 2)
Comparing performance of:
object spread vs immutable
Created:
4 years ago
by:
Registered User
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HTML Preparation code:
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/4.0.0/immutable.min.js"></script>
Tests:
object spread
let obj = {}; for (i = 0; i < 100; i++) { const key = 'key' + i const value = 'value' + i obj = { ...obj, [key]: { key, value } } }
immutable
let obj = Immutable.Map() for (i = 0; i < 100; i++) { const key = 'key' + i const value = 'value' + i obj = obj.set(key, { key, value }) }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
object spread
immutable
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The MeasureThat.net benchmark is designed to compare the performance of two JavaScript approaches: object spread (also known as the "rest parameter" syntax) and using an Immutable.js library. **Script Preparation Code** The script preparation code includes a reference to the Immutable.js library, which is loaded from a CDN. This library provides a way to work with immutable data structures in JavaScript. **Individual Test Cases** There are two test cases: 1. **Object Spread**: The benchmark definition creates an object `obj` and then uses a for loop to add 100 properties to it using the rest parameter syntax (`...obj, [key]: { ... }`). This is a common use case for object spread in JavaScript. 2. **Immutable.js**: The second benchmark definition uses Immutable.js to create an immutable map and adds 100 key-value pairs to it using the `set()` method. Immutable.js is designed to provide a safer way of working with data structures, as changes to the data are not reflected directly in the original object. **Comparison of Object Spread and Immutable.js** Both approaches have their pros and cons: **Object Spread:** Pros: * Lightweight and easy to use * Native JavaScript support, so no additional libraries are required Cons: * Can be slower than Immutable.js due to the overhead of creating a new object on each iteration * Mutates the original object, which can lead to unexpected behavior if not handled carefully **Immutable.js:** Pros: * Provides a safer way of working with data structures, as changes are isolated and do not affect the original object * Can be faster than object spread due to the use of immutable data structures, which reduces the need for frequent object mutations Cons: * Requires an additional library, which can add overhead * Can be more complex to use, especially for those familiar with traditional JavaScript mutability **Other Considerations** When deciding between object spread and Immutable.js, consider the following factors: * **Performance:** If speed is critical, Immutable.js might be a better choice due to its ability to work with immutable data structures. * **Complexity:** If you need to work with complex data structures or require isolation of changes, Immutable.js might be a better fit. However, if simplicity and ease of use are more important, object spread could be the way to go. * **Use case:** Consider whether your specific use case requires the safety features provided by Immutable.js or if object spread's lightweight nature is sufficient. **Alternative Approaches** Other alternatives for achieving similar results include: * Using a library like Lodash, which provides its own version of object spread (`_.merge()`). * Implementing custom mutators and transformers to work with objects in a more functional programming style. * Using other immutable libraries, such as RxJS or Preact. Ultimately, the choice between object spread and Immutable.js depends on your specific requirements and preferences. MeasureThat.net's benchmark provides a useful comparison of these two approaches, allowing you to make an informed decision for your own projects.
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