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Cópia de obj
(version: 0)
Cópia de obj
Comparing performance of:
Spread vs Object.assign()
Created:
7 years ago
by:
Guest
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Script Preparation code:
var objPai = { prop1: 'valor prop1', prop2: function () { console.log('Sou uma função do objPai') }, prop3: { sou: 'Um obj do objPai' } }
Tests:
Spread
var objFilho1 = { ...objPai }
Object.assign()
var objFIlho2 = Object.assign({ }, objPai)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Spread
Object.assign()
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark JSON and analyze what's being tested. **Benchmark Overview** The benchmark is designed to measure the performance of two different methods for creating an object: using the spread operator (`...`) and using `Object.assign()`. The benchmark uses a sample JavaScript object, `objPai`, which has several properties, including a function property and another object as a child property. **Options being compared** The two options being compared are: 1. **Spread Operator (`...`)**: This method creates a new object by spreading the properties of an existing object (`objPai`) into a new object. 2. **Object.assign()**: This method assigns the properties of one or more source objects to a destination object. **Pros and Cons** **Spread Operator (`...`):** Pros: * Concise and expressive syntax * Creates a shallow copy of the original object, which is suitable for most use cases Cons: * May not be as efficient as other methods for large objects or deep copies * Not supported in older browsers (e.g., IE 11) **Object.assign():** Pros: * Well-supported in all modern browsers and Node.js versions * Can be used to create a deep copy of an object by specifying `undefined` as the value for inherited properties Cons: * Less concise syntax compared to the spread operator * May introduce performance overhead due to the need to iterate over the source objects' properties **Other considerations** * Both methods have a time complexity of O(n), where n is the number of properties in the original object. However, `Object.assign()` may perform slightly better due to its ability to use built-in optimizations. * The benchmark measures the execution speed of each method, which is influenced by factors like browser performance, object size, and the complexity of the properties. **Library usage** The benchmark does not rely on any external libraries, as it only uses native JavaScript features. However, if we were to consider additional dependencies, `Object.assign()` might use the `native Object.prototype` implementation in newer browsers, which may be optimized for performance. **Special JS feature or syntax** There is no special JavaScript feature or syntax used in this benchmark beyond what's considered standard for modern JavaScript development. **Alternatives** Other methods for creating an object could be tested in future benchmarks. Some alternatives include: * Using the `Literall` function (not a built-in method) which was previously supported by some browsers but is not anymore. * Using `Object.create()` and then assigning properties to the resulting object. * Using a library like Lodash's `cloneDeep()` or other custom deep cloning solutions. For more optimal performance, you could also consider using libraries like `lodash` for its deep cloning functionality.
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