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Spread vs. Object assign
(version: 0)
Comparing performance of:
Using the spread operator vs Using Object.assign
Created:
4 years ago
by:
Guest
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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):
**Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark test case, comparing two approaches: using the spread operator (`...`) and `Object.assign()`. **What is being tested?** The test case measures the performance difference between creating an object by spreading two existing objects (`const finalObject = { ...firstObject, ...secondObject }`) and using the `Object.assign()` method to merge two objects (`const finalObject = Object.assign({}, firstObject, secondObject)`). **Options compared** Two approaches are being compared: 1. **Spread operator**: Using the spread operator (`...`) to create a new object by copying properties from existing objects. 2. **`Object.assign()`**: Using the `Object.assign()` method to merge two objects into a new object. **Pros and Cons of each approach:** * **Spread operator**: + Pros: - More concise and readable code - Avoids creating an intermediate object (i.e., no extra memory allocation) + Cons: - May not be supported in older browsers or environments - Can lead to slower performance if the objects being spread have many properties * **`Object.assign()`**: + Pros: - Wide browser support and compatibility - Suitable for large datasets and complex object merging scenarios + Cons: - More verbose code compared to the spread operator - Creates an intermediate object, which can lead to slower performance if the objects being merged have many properties **Library used** None, as this benchmark only uses native JavaScript features. **Special JS feature or syntax** The `...` spread operator is a new feature introduced in ECMAScript 2015 (ES6). It allows for creating new objects by copying properties from existing objects. **Other considerations:** * Both approaches assume that the objects being merged do not have any nested objects, arrays, or functions as values. If such values are present, additional modifications may be necessary. * The benchmark does not account for potential caching or optimization effects in modern browsers. **Alternatives** If you need to compare other object merging techniques, consider using: 1. `Object.create()` and `Object.assign()` 2. `lodash.merge` (a popular utility library function) 3. Custom implementation using a loop or recursion Keep in mind that the choice of approach depends on your specific use case, performance requirements, and target browser environments.
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