Benchmark: bechn Spread operator VS Object.assign VS Object.create

Script Preparation code:

for (i = 0; i < 10; i++) {

}

Tests:

Test Spread operator
const firstObject = { sampleData: 'Hello world', sampleMethod: () => { return true; } }; const secondObject = {...firstObject}; Object.setPrototypeOf(secondObject, Object.getPrototypeOf(firstObject));
Test Object.create
const firstObject = { sampleData: 'Hello world', sampleMethod: () => { return true; } }; const secondObject = Object.create(Object.getPrototypeOf(firstObject), Object.getOwnPropertyDescriptors(firstObject));
Test Object.assign
const firstObject = { sampleData: 'Hello world', sampleMethod: () => { return true; } }; const secondObject = Object.assign({}, firstObject); Object.setPrototypeOf(secondObject, Object.getPrototypeOf(firstObject));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Test Spread operator
Test Object.create
Test 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):

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Let's break down the provided benchmark and explain what's being tested, along with the pros and cons of each approach.

**Benchmark Overview**

The benchmark is designed to compare the performance of three different methods for creating shallow copies of objects in JavaScript:

1. **Spread Operator (`...`)**: Introduced in ECMAScript 2018, this operator allows you to create a new object by spreading the properties of an existing object.
2. **Object.assign()**: A built-in method that creates a shallow copy of an object.
3. **Object.create()**: A method that creates a new object with the specified prototype and inherits properties from it.

**Pros and Cons of Each Approach**

1. **Spread Operator (`...`)**:
	* Pros: concise, readable, and efficient for simple objects.
	* Cons: may not work as expected when dealing with complex objects or inheritance, and can be slower than Object.assign() for large datasets.
2. **Object.assign()**:
	* Pros: widely supported, fast, and works well with most object types.
	* Cons: may require additional work to handle inherited properties correctly.
3. **Object.create()**:
	* Pros: allows for fine-grained control over inheritance and property creation.
	* Cons: can be less readable and more verbose than other methods.

**Library Usage**

None of the benchmark tests explicitly use any external libraries, but `Object.getOwnPropertyDescriptors()` is used in some test cases to create an object with inherited properties. This method is a part of the ECMAScript standard and does not require any additional library inclusion.

**Special JS Feature/Syntax**

The benchmark uses ES2018 syntax for the spread operator (`...`), which might not be supported by older JavaScript engines or environments that don't support this feature.

**Other Alternatives**

Besides the three methods being compared in this benchmark, other alternatives exist:

* **lodash.cloneDeep()**: A popular utility library function that creates a deep copy of an object.
* **immer.js**: A library that provides immutable data structures and functions for creating copies of objects.

Keep in mind that these alternatives might have different performance characteristics or trade-offs depending on the specific use case.

**Benchmark Results**

The latest benchmark results show that `Object.assign()` is currently the fastest method, followed closely by the spread operator (`...`). The performance difference between these methods may become more pronounced as object sizes and complexity increase.

Related benchmarks:

bechn Spread operator VS Object.assign VS Object.create (version: 0)

Comparing performance of: Test Spread operator vs Test Object.create vs Test Object.assign

Created: 5 years ago by: Guest

Jump to the latest result

Test Spread operator

Test Object.create

Test Object.assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):