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for of & Object.keys().forEach
(version: 2)
Comparing performance of:
lodash.forEach vs native
Created:
4 years ago
by:
Registered User
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HTML Preparation code:
<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>
Script Preparation code:
var values = {a:1, b:2, c:3, d:4, f:5, g:6};
Tests:
lodash.forEach
const o = {}; for (const f in values) { o[f] = values[f]; }
native
const o = {}; Object.keys(values).forEach((f)=>(o[f]=values[f]));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
lodash.forEach
native
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net! The provided benchmark measures the performance of two approaches to iterate over an object using its own keys: **Approach 1: Using `for...in` loop with a library (Lodash)** ```javascript for (const f in values) { o[f] = values[f]; } ``` **Approach 2: Using the native `Object.keys()` method without any additional libraries** The main difference between these two approaches is the usage of a library, Lodash. **Library: Lodash** Lodash is a popular JavaScript utility library that provides a wide range of functional programming tools and methods. In this specific benchmark, Lodash's `forEach` function is used to iterate over the keys of an object and execute a callback function for each key. Pros of using Lodash: 1. **Convenience**: Lodash provides a simple and concise way to iterate over objects, making it easy to write readable code. 2. **Abstraction**: By encapsulating the iteration logic in a library, developers can focus on the business logic without worrying about the underlying iteration mechanism. Cons of using Lodash: 1. **Performance overhead**: Using a library adds a small performance overhead due to the need for function calls and object lookups. 2. **Dependency on the library**: If the development environment or build process is modified, the code may break if the library is not available or updated. **Native `Object.keys()` method** This approach uses the native JavaScript method `Object.keys()` to get an array of the object's own keys and then iterates over it using a `forEach` loop. Pros of using the native `Object.keys()` method: 1. **Performance**: This approach is generally faster since it doesn't require any additional library calls. 2. **No dependency on the library**: The code works without relying on Lodash or any other external libraries. Cons of using the native `Object.keys()` method: 1. **Less concise**: Writing this approach requires more boilerplate code compared to using a library like Lodash. 2. **More verbose**: The loop iteration is explicit, which may lead to more lines of code and make it less readable for complex iterations. **Other alternatives** For iterating over objects in JavaScript, other approaches include: 1. **Using `for...in` loop directly**: Without any additional libraries or methods, developers can use the built-in `for...in` loop to iterate over an object's own keys. 2. **Using `Map` or `Set` data structures**: For more complex iterations, using a `Map` or `Set` data structure with the `forEach` method can provide better performance and scalability. In conclusion, when deciding between these approaches, consider factors such as: * Performance requirements: If speed is critical, using the native `Object.keys()` method might be a better choice. * Code readability and maintainability: Using Lodash or other libraries can make the code more concise and readable for complex iterations. * Dependency on external libraries: Be mindful of the library's availability and updates when choosing this approach. I hope this explanation helps software engineers understand the nuances behind these JavaScript microbenchmarks!
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