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lodash extendvs object.assign vs spread
(version: 0)
Comparing performance of:
lodash extend vs object.assign vs spread
Created:
7 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:
lodash extend
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var c = _.extend(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 extend
object.assign
spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** The provided JSON represents a JavaScript benchmarking test case on the MeasureThat.net website. The test compares three approaches to merge two objects: `lodash.extend`, `object.assign`, and the spread operator (`{ ...a, ...b }`). **Approaches Compared** 1. **Lodash `extend`**: A function from the popular Lodash library that merges two or more objects into a new object. 2. **Object `assign`**: A method on the `Object` prototype that merges two or more objects into a new object. 3. **Spread Operator (`{ ...a, ...b }`)**: A new syntax introduced in ECMAScript 2015 that merges two objects into a new object. **Pros and Cons** 1. **Lodash `extend`**: * Pros: + Highly customizable with options like `deepMerge`, `defaults`, etc. + Can handle complex data structures, including arrays and other objects. * Cons: + Adds external dependency (Lodash library). + May have performance overhead due to the additional function call. 2. **Object `assign`**: * Pros: + Built-in method, no external dependency. + Fast and efficient, as it's implemented in native code. * Cons: + Only works with two objects; more complex merge scenarios require additional libraries or workarounds. 3. **Spread Operator (`{ ...a, ...b }`)**: * Pros: + Lightweight and fast, no external dependencies. + Simple to use and read. * Cons: + Only works with two objects; more complex merge scenarios require additional libraries or workarounds. **Library and Syntax** The test uses the Lodash library for the `extend` function. The spread operator is a new syntax introduced in ECMAScript 2015, allowing you to merge two objects into a new object using `{ ...a, ...b }`. **Considerations** * When working with complex data structures or arrays, `lodash.extend` might be a better choice due to its customization options and ability to handle nested objects. * For simple object merges, the spread operator or `Object.assign` might be sufficient and more efficient. * If you're looking for a lightweight solution without external dependencies, the spread operator could be the best option. **Alternatives** Other alternatives for merging objects in JavaScript include: 1. **Merge sort**: A sorting algorithm that can also be used to merge two objects. 2. **Object.assign()` with a custom function**: You can create a custom function that merges two objects using `object.assign()`. 3. **Third-party libraries like Immutable.js or Mapbox's deepmerge**: These libraries provide more advanced features for merging complex data structures. Keep in mind that the choice of approach depends on your specific use case, performance requirements, and personal preference.
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lodash.assign vs object.assign vs spread
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