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Object.assign vs direct copy
(version: 0)
Comparing performance of:
Object.assign vs Direct
Created:
6 years ago
by:
Registered User
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Tests:
Object.assign
const obj = {hello:"world"}; const newOne = Object.assign({}, obj);
Direct
const obj = {hello:"world"}; const newOne = {...obj};
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Object.assign
Direct
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the JavaScript microbenchmark on MeasureThat.net. **Benchmark Definition** The benchmark measures the performance of two approaches to create a shallow copy of an object in JavaScript: 1. `Object.assign()`: This method creates a new object with the specified properties, copied from the original object. 2. `{...obj}`: This syntax is called "object spread" or "spread operator." It creates a new object with the same properties as the original object. **Options Compared** The benchmark compares these two approaches: * **Pro of `Object.assign()`:** It is a widely supported method in older browsers, and it provides more control over the creation process. * **Con of `Object.assign()`:** It can lead to slower performance due to the overhead of creating a new object and copying properties. * **Pros of `{...obj}`:** It is faster and more concise than using `Object.assign()`. * **Cons of `{...obj}`:** + **Browser Support**: While widely supported in modern browsers, older versions might not be compatible. + **Performance Variability**: The performance benefits may vary across different JavaScript engines. **Library Used** None. This benchmark only uses built-in JavaScript features. **Special JS Features/Syntax** Yes, the `Object.assign()` method is used, which is a built-in JavaScript function. The `{...obj}` syntax is also supported in modern browsers and JavaScript engines. **Benchmark Preparation Code** The script preparation code is empty, as no custom logic or setup is required for this benchmark. **Other Alternatives** Besides the two approaches tested here, other methods to create shallow copies of objects include: * `Array.prototype.slice()` with `Object.assign()`: Creates a new array and then uses `Object.assign()` to copy properties from the original object. * Using `lodash` library's `cloneDeep()`, `assign()`, or `pick()` methods: Provides more flexibility and customization options, but comes with a performance overhead due to the library. In summary, this benchmark helps measure the performance difference between using `Object.assign()` versus the spread operator syntax for creating shallow copies of objects in JavaScript.
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