Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Object Assign vs Spread test
(version: 0)
Comparing performance of:
Object Assign Empty vs Spread Empty
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
Object Assign Empty
let sampleData = {}; let moreData = { moreData: 1 }; const finalObject = Object.assign(sampleData, moreData);
Spread Empty
let sampleData = {}; let moreData = { moreData: 1 }; const finalObject = { ...sampleData, ...moreData };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Object Assign Empty
Spread Empty
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 break down what's being tested in this benchmark. **Benchmark Definition** The benchmark is testing two different ways to assign properties to an object in JavaScript: using `Object.assign()` and the spread operator (`...`). **Options compared** The two options being compared are: 1. **`Object.assign(sampleData, moreData)`**: This method takes two objects as arguments and merges them into a new object. It returns the merged object. 2. **`{ ...sampleData, ...moreData }`**: This is an example of using the spread operator to create a new object by spreading the properties of `sampleData` and `moreData`. **Pros and Cons** * **`Object.assign()`**: + Pros: Wide browser support, fast, and efficient. It's also relatively simple to understand. + Cons: Can be slower than other methods for very large objects due to its overhead. Also, it can result in a new object being created, which might not be desirable in some cases. * **Spread Operator (`...`)**: + Pros: Creates a new object with the same prototype as `sampleData`, is faster and more efficient than `Object.assign()` for small objects, and doesn't create a temporary copy of the original object. + Cons: Requires modern browsers (ECMAScript 2015+) to work, can be less intuitive for those not familiar with this syntax. **Library usage** There doesn't appear to be any external libraries used in this benchmark. **Special JS feature/syntax** The spread operator (`...`) is a relatively new JavaScript feature introduced in ECMAScript 2015. It's a shorthand way of creating a new object by copying the properties of an existing object. In the context of this benchmark, using the spread operator creates a new object with the same prototype as `sampleData`, which can be beneficial when working with inheritance or complex object structures. **Alternative approaches** Other ways to assign properties to an object include: * Using the assignment operator (`=`) and chaining multiple assignments (e.g., `sampleData.property = value;` followed by `moreData.property = value;`) * Using `Object.create()` and assigning properties using the `propertyAssignment` method * Using a library like Lodash or Underscore.js, which provide their own implementations of object assignment methods However, these alternatives are not being tested in this benchmark. **Benchmark preparation code** The script preparation code is empty, indicating that no custom setup or initialization is required for this benchmark. The `Html Preparation Code` is also empty, suggesting that the test can be run without any specific HTML context. Overall, this benchmark provides a simple and straightforward comparison between two common methods of object assignment in JavaScript, allowing users to see which approach performs better in different scenarios.
Related benchmarks:
Spread vs Object.assign (modify ) vs Object.assign (new)
object.assign vs spread to create a copy
Object.assign mutation vs spread
JavaScript spread operator vs Object.assign performance - Kien Nguyen
Object.assign() vs spread operator (New object)
Comments
Confirm delete:
Do you really want to delete benchmark?