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lodash 21 merge vs object.assign vs spread
(version: 0)
Comparing performance of:
lodash merge vs object.assign vs spread
Created:
3 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>
Tests:
lodash merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.merge(a, b);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = Object.assign(a, b);
spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; 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 provided benchmark. **What is being tested?** The benchmark tests three approaches for merging two objects in JavaScript: 1. `_.merge` from the Lodash library 2. `Object.assign` 3. Spread syntax (`{ ...a, ...b }`) These three approaches are compared to determine which one performs best in terms of execution time. **Options comparison** Here's a brief overview of each approach and their pros and cons: 1. **Lodash `_merge`**: This function merges two objects recursively. It's a powerful tool for merging complex objects, but it can also be slower due to its recursive nature. * Pros: flexible, supports nested objects * Cons: potentially slow, unnecessary complexity 2. **`Object.assign`**: This method creates a new object by copying all enumerable own properties from one or more source objects into a new object. * Pros: simple, fast * Cons: can be slower for large objects due to the overhead of creating a new object 3. **Spread syntax (`{ ...a, ...b }`)**: This syntax creates a new object by spreading the properties of two or more objects into a new object. * Pros: concise, efficient * Cons: limited support for nested objects, requires JavaScript 2015+ syntax **Library and its purpose** The Lodash library is a popular utility belt for JavaScript. It provides a wide range of functions for tasks such as: * Array manipulation * Object merging * String formatting * Event handling In this benchmark, the `_merge` function from Lodash is used to merge two objects. **Special JS feature or syntax** The spread syntax (`{ ...a, ...b }`) requires JavaScript 2015+ syntax. It's a relatively new feature that allows for more concise object creation and merging. **Other alternatives** If these three approaches are not sufficient, other options could include: * Using the `Object.create()` method to create a new object and then assigning properties from another object * Using a library like Underscore.js or Ramda, which offer alternative merge functions Keep in mind that these alternatives may have their own trade-offs in terms of performance, simplicity, and compatibility with older JavaScript versions. **Benchmark preparation code** The provided HTML preparation code includes the Lodash library, which is used for the `_.merge` function. The script preparation code is empty, indicating that no additional setup or initialization is required before running the benchmark. I hope this explanation helps you understand what's being tested in this benchmark!
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