Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
JavaScript spread operator vs Object.assign performance vs basic
(version: 0)
Comparing performance of:
Using Object.assign vs Basic object creation
Created:
3 years ago
by:
Guest
Jump to the latest result
Tests:
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } Object.assign(firstObject, secondObject); Object.assign(firstObject, secondObject); Object.assign(firstObject, secondObject); Object.assign(firstObject, secondObject); Object.assign(firstObject, secondObject);
Basic object creation
const firstObject = { first: 'lol', second: "lol", third: "lol", forth: "lol" } const secondObject = { fifth: 'lol' } const finalObject = { first: firstObject.first, second: firstObject.second, third: firstObject.third, forth: firstObject.forth, fifth: secondObject.fifth }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Using Object.assign
Basic object creation
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Purpose** The provided benchmark tests three approaches to create objects in JavaScript: 1. Using `Object.assign` (Test Case 1) 2. Basic object creation without any libraries or special features (Test Case 2) **Options Compared** * **Using Object.assign**: This approach uses the `Object.assign()` method to merge two or more objects into a new object. It's a concise way to copy properties from one object to another. * **Basic object creation**: This approach creates an object from scratch using the `{}` syntax, assigning values directly to its properties. **Pros and Cons** * **Using Object.assign**: + Pros: Concise, efficient, and widely supported in modern browsers. + Cons: May not be suitable for large objects or complex data structures. Can also lead to unexpected behavior if not used carefully (e.g., overwriting existing properties). * **Basic object creation**: + Pros: Flexible, allows for more control over the object's structure, and can be faster for small objects. + Cons: Requires more code and may be less efficient than `Object.assign` for large objects. **Library/ Special Feature** None of the test cases use any libraries or special features beyond standard JavaScript syntax. However, it's worth noting that some browsers have implemented additional features like `const` declaration (used in Test Case 2), which can affect object creation performance. **Test User Considerations** When creating objects in JavaScript, consider the following: * For small objects, basic object creation might be faster and more efficient. * For larger objects or complex data structures, using `Object.assign` might be a better choice due to its concise nature and widespread support. * Be mindful of potential pitfalls with `Object.assign`, such as overwriting existing properties. **Alternatives** If you're looking for alternative approaches to create objects in JavaScript, consider: * **Object.create()**: Creates an object from a given prototype. This method is less commonly used than `Object.assign` but can provide more control over the object's inheritance hierarchy. * **Class declarations**: Using class declarations (e.g., `class MyClass { constructor(props) { ... } }`) can create objects in a more explicit and controlled manner. * **New Object() syntax**: Creating an object using the `new` keyword followed by parentheses containing the desired properties is another way to create objects. Keep in mind that the performance differences between these approaches might be negligible for small objects, but they can become significant when working with large datasets or complex data structures.
Related benchmarks:
object assign vs object spread on growing objects
JavaScript spread operator vs Object.assign performance (single addition)
JavaScript spread operator vs Object.assign performance - Kien Nguyen
Object.assign() vs spread operator (New object)
JavaScript spread operator vs Object.assign performance test number 99
Comments
Confirm delete:
Do you really want to delete benchmark?