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JavaScript spread operator vs Object.assign performance (mine)
(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 finalObject = { ...firstObject, };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const finalObject = Object.assign({}, firstObject);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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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):
**Understanding the Benchmark** The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, where users can create and run benchmarks to compare performance of different approaches. **Benchmark Definition** The benchmark definition is not explicitly stated in the provided JSON, but based on the two individual test cases, it appears that the benchmark compares the performance of two ways to merge objects: 1. Using the spread operator (`...`) 2. Using `Object.assign()` **Options Compared** The two options compared are: * **Using the spread operator**: This approach uses the syntax `const finalObject = {...firstObject}` to create a new object by copying the properties of the original object (`firstObject`) into the new object. * **Using `Object.assign()`**: This approach uses the `Object.assign()` method to create a new object and copy the properties of the original object (`firstObject`) into it. **Pros and Cons** * **Using the spread operator**: + Pros: concise, easy to read, and expressive. It's also a modern JavaScript feature. + Cons: performance may be slower due to the creation of a new object. * **Using `Object.assign()`**: + Pros: widely supported across older browsers and versions of Node.js. + Cons: less readable and less expressive compared to the spread operator. **Other Considerations** The benchmark also considers the following: * **Library usage**: Neither option uses an external library, but `Object.assign()` is a built-in method in JavaScript, while the spread operator was introduced in ECMAScript 2018 (ES2018). * **Special JS features or syntax**: Both options use modern JavaScript features, but the spread operator is a specific syntax introduced in ES2015. * **Browser and platform differences**: The benchmark results are reported for Chrome 91 on Linux desktop. **Alternatives** Other alternatives to using the spread operator and `Object.assign()` include: * Using the `concat()` method: `const finalObject = firstObject.concat({})`. * Using the `merge` library: `const finalObject = merge(firstObject, {})`. (Note: this option is not included in the provided benchmark.) * Using a custom implementation of object merging. It's worth noting that the performance difference between these approaches may be negligible for most use cases. The spread operator and `Object.assign()` are both widely supported and commonly used in modern JavaScript development.
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