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Lodash assign vs native assign
(version: 0)
Comparing performance of:
Spread vs Lodash assign vs Native assign
Created:
3 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:
Spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = { ...a, ...b };
Lodash assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.assign({}, a, b);
Native assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign({}, a, b);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Spread
Lodash assign
Native assign
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested, compared, and considered. **Benchmark Overview** The benchmark tests three approaches to merge two objects in JavaScript: spreading (using the `...` operator), Lodash's `assign()` function, and native `Object.assign()` method. The goal is to determine which approach is the fastest. **Options Compared** 1. **Spreading**: This approach uses the `...` operator to spread the properties of one object into another. It creates a new object with all the keys from both objects. 2. **Lodash assign**: Lodash provides a utility function called `assign()` that can merge multiple objects into a single object. In this benchmark, it's used to compare its performance with native methods. 3. **Native Object.assign()**: This is the built-in method in JavaScript for merging two objects. **Pros and Cons** * **Spreading**: + Pros: Simple, concise syntax; works with any type of object (not just objects). + Cons: Can be slower due to the overhead of creating a new object. * **Lodash assign**: + Pros: Optimized for performance; can handle complex merges and merging multiple objects at once. + Cons: Requires an external library (Lodash), which may have its own dependencies and potential issues with versions or updates. * **Native Object.assign()**: + Pros: Built-in, no additional dependencies required; works well with native types like arrays and sets. + Cons: May not be as efficient for complex merges compared to optimized libraries like Lodash. **Library and Syntax** In this benchmark, the `Lodash assign()` function is used. Lodash is a popular JavaScript library that provides utility functions for various tasks, including array manipulation, string manipulation, and object merging. The `assign()` method takes multiple objects as arguments and returns a new merged object. No special JavaScript features or syntax are being tested in this benchmark, so we can focus on the performance comparison of these three approaches. **Alternatives** If you're looking for alternatives to Lodash's `assign()` function or want to explore other options, here are a few: * **ES6 Spread Syntax**: If you're using modern JavaScript and don't need the additional functionality provided by Lodash, you can use the spread syntax (`{ ... }`) for object merging. * **Native Object.assign() Variants**: Some browsers provide faster variants of `Object.assign()` for specific use cases (e.g., `Object.assign({}, a, b)` is faster than `Object.assign(a, b)`). * **Other Libraries**: Other libraries like underscore.js or moment.js might offer similar functionality to Lodash's `assign()` method. Keep in mind that performance optimizations often depend on the specific use case and requirements of your project.
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