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lodash merge vs object.assign vs spread v2222
(version: 0)
Comparing performance of:
lodash merge vs object.assign vs spread
Created:
7 years ago
by:
Registered User
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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 merge
var a = { "index": 1, "index_start_at": 56, "integer": 38, "float": 17.9152, "name": "Jim", "surname": "Cherry", "fullname": "Jennifer McLean", "email": "dan@crane.et", "bool": false } var b = { "index": 2, "index_start_at": 57, "integer": 4, "float": 19.2675, "name": "Sue", "surname": "Houston", "fullname": "Ralph Bolton", "email": "glenda@walton.fr", "bool": false } var c = _.merge(a, b);
object.assign
var a = { "index": 1, "index_start_at": 56, "integer": 38, "float": 17.9152, "name": "Jim", "surname": "Cherry", "fullname": "Jennifer McLean", "email": "dan@crane.et", "bool": false } var b = { "index": 2, "index_start_at": 57, "integer": 4, "float": 19.2675, "name": "Sue", "surname": "Houston", "fullname": "Ralph Bolton", "email": "glenda@walton.fr", "bool": false } var c = Object.assign(a, b);
spread
var a = { "index": 1, "index_start_at": 56, "integer": 38, "float": 17.9152, "name": "Jim", "surname": "Cherry", "fullname": "Jennifer McLean", "email": "dan@crane.et", "bool": false } var b = { "index": 2, "index_start_at": 57, "integer": 4, "float": 19.2675, "name": "Sue", "surname": "Houston", "fullname": "Ralph Bolton", "email": "glenda@walton.fr", "bool": false } var c = { ...a, ...b };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
lodash merge
object.assign
spread
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! **What is being tested?** The provided benchmark tests three approaches for merging two objects: 1. `_.merge` (from the Lodash library) 2. `Object.assign` 3. Spread operator (`...`) These approaches are compared to determine which one performs best in terms of execution speed. **Options comparison:** Here's a brief overview of each approach: * **_.merge**: This function from Lodash takes two objects as input and returns a new object with the merged properties. + Pros: Well-tested, widely supported, and provides more control over the merge process. + Cons: Additional dependency on Lodash, might be slower due to the overhead of the library. * **Object.assign**: This method returns a new object with the assigned values from another object. + Pros: Built-in JavaScript method, fast, and widely supported. + Cons: Can lead to unexpected behavior if not used carefully (e.g., overwriting existing properties). * **Spread operator (`...`)**: This syntax creates a new object with spreadable properties from an existing object(s). + Pros: Fast, simple, and concise. No additional dependencies required. + Cons: Limited control over the merge process, might not work as expected if objects have different property types. **Other considerations:** * **Libraries**: The `_.merge` function uses a variety of algorithms to handle different cases (e.g., arrays, null, undefined). While this provides more flexibility, it also introduces additional overhead. * **Browser differences**: The benchmark results show variations in execution speed across different browsers and devices. This highlights the importance of testing on multiple platforms to ensure accurate results. **What is the library used?** The `_.merge` function comes from the Lodash library (version 4.17.5). Lodash is a popular utility library for JavaScript that provides various helper functions, including `merge`. **Special JS features or syntax:** There are no specific JavaScript features or syntaxes mentioned in the benchmark definition. However, it's worth noting that modern JavaScript versions (ECMAScript 2018 and later) support the spread operator (`...`) as a part of the language. **Alternative approaches:** If you're interested in exploring other options, here are a few alternatives: * **Recursive merge**: You can implement your own recursive merge function using a simple loop. This approach provides full control over the merge process but might be slower and more error-prone than the built-in methods. * **JSON merge libraries**: There are dedicated JSON merge libraries available that offer advanced features like merging arrays, objects with different property types, and handling null or undefined values. * **Simple object copy**: You can also use a simple `Object.assign` chain to create a new object with merged properties. While this approach is concise, it might not provide the best performance or flexibility. I hope this explanation helps you understand the benchmark!
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