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JavaScript spread operator vs Object.assign performance (blackcoffeecat)
(version: 0)
Comparing performance of:
Using the spread operator vs Using Object.assign
Created:
5 years ago
by:
Registered User
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Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject, secondObject);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Using the spread operator
Using Object.assign
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 explaining what's being tested on MeasureThat.net. **What is being tested?** MeasureThat.net is testing the performance of two approaches to merge objects in JavaScript: the spread operator (`...`) and `Object.assign()`. The benchmark is designed to measure which approach is faster, allowing users to compare their performance under different scenarios. **Options compared:** 1. **Spread Operator (`...`)**: This method uses the syntax `{ ...firstObject, ...secondObject }` to merge two objects. It creates a new object by copying properties from both input objects. 2. **Object.assign()**: This method takes multiple sources (in this case, `firstObject` and `secondObject`) as arguments and returns a new object with merged properties. **Pros and Cons:** * Spread Operator (`...`): + Pros: - More concise and readable code - Can be used to merge objects in a more expressive way + Cons: - May not be as efficient as `Object.assign()` for large objects or deep merges - Requires compatibility with older browsers (before ECMAScript 2018) * Object.assign(): + Pros: - More efficient for large objects or deep merges - More widely supported across browsers and Node.js versions + Cons: - Less readable code compared to the spread operator - Can be more verbose **Library usage:** In this benchmark, no specific libraries are used. However, `Object.assign()` relies on the built-in JavaScript object methods. **Special JS features/syntax:** None mentioned in the provided Benchmark Definition json or individual test cases.
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