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spread vs. object.assign
(version: 0)
Comparing performance of:
spread vs object.assign
Created:
4 years ago
by:
Guest
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Tests:
spread
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject);
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Suite status:
<idle, ready to run>
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Test case name
Result
spread
object.assign
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested. **Benchmark Definition** The benchmark measures the performance difference between two ways to merge objects: using the spread operator (`...`) and `Object.assign()`. The test case is creating two objects, `firstObject` and `secondObject`, and then merging them into a third object, `finalObject`. **Options Compared** Two options are being compared: 1. **Spread Operator (Spreading)**: Using the spread operator (`...`) to merge objects. This syntax allows you to create a new object by copying the keys of one object and assigning them new values from another object. 2. **Object.assign()**: The built-in `Object.assign()` method is used to merge two or more objects into a single object. **Pros and Cons** * **Spread Operator (Spreading)**: + Pros: More concise and readable code, works with objects of any shape, can be used with array literals. + Cons: Can lead to unexpected behavior if not used carefully, requires JavaScript version 4 or later for support. * **Object.assign()**: + Pros: Widely supported across browsers and versions, provides a clear method for merging objects. + Cons: Can be less concise than the spread operator, may lead to code that's harder to read. **Library and Purpose** None of the provided benchmark definitions use any external libraries. However, the `Object.assign()` method is a built-in part of JavaScript. **Special JS Feature or Syntax** There are no special JavaScript features or syntaxes being tested in this benchmark. **Other Alternatives** If you're interested in alternative methods for merging objects, some other options include: * Using a library like Lodash's `merge()` function * Using the `Object.create()` method and setting properties on the resulting object * Using a custom implementation of the merge logic Keep in mind that each approach has its own trade-offs, and the choice of which one to use depends on your specific requirements and performance considerations. In this benchmark, MeasureThat.net is comparing the performance difference between two common ways to merge objects: using the spread operator and `Object.assign()`. By running multiple executions under different conditions (in this case, using Chrome 101 browser), you can get a better understanding of which method performs better in your specific use case.
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