Benchmark: Копи обжект

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

var MyObject = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  },
  bigArray: Array.from({length: 4000}, () => ({[Math.floor(Math.random() * 40000)]: Math.floor(Math.random() * 40000)})),
  foo(a) {
    console.log('foo' + a)
  }
};

Tests:

1
_.cloneDeep(MyObject)
2
JSON.parse(JSON.stringify(MyObject))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the provided JavaScript microbenchmark.

**Benchmark Overview**

The benchmark measures the performance of two different methods for creating a deep copy of an object: `_.cloneDeep` from Lodash and `JSON.parse(JSON.stringify)`. The benchmark creates a sample object with various properties, including arrays and nested objects.

**Options Compared**

Two options are compared:

1. **_.cloneDeep(MyObject)**: This method uses the Lodash library to create a deep copy of the `MyObject`.
2. **JSON.parse(JSON.stringify(MyObject))**: This method uses the built-in `JSON` object in JavaScript to create a deep copy of the `MyObject`. It converts the entire object to a JSON string, parses it back into an object, and then creates a new copy.

**Pros and Cons**

1. **_.cloneDeep(MyObject)**:
	* Pros: Generally faster than the built-in method because it doesn't require parsing the object twice.
	* Cons: Requires the Lodash library, which may not be included in all environments.
2. **JSON.parse(JSON.stringify(MyObject))**:
	* Pros: No additional dependencies required, as it's a built-in JavaScript function.
	* Cons: Can be slower due to the double parsing step.

**Library: Lodash**

Lodash is a popular utility library for JavaScript that provides various functions for tasks like array manipulation, string manipulation, and object creation. In this benchmark, `_.cloneDeep` is used to create a deep copy of an object.

**Special JS Feature/Syntax**

None of the test cases use any special JavaScript features or syntax that require explanation.

**Other Alternatives**

If you prefer not to use Lodash or if it's not available in your environment, other alternatives for creating a deep copy of an object include:

1. **Object.assign()**: Can be used with a target object and an array of source objects to create a shallow copy. However, this method may not work correctly for nested objects.
2. **Array.prototype.slice() + Object.create()**: A more manual approach that creates a new object by cloning the properties from the original object using `Object.create()` and then iterating over the properties with `Array.prototype.slice()`.
3. **For...in loops**: Another manual approach that uses a for...in loop to iterate over the properties of the original object and create a new copy.

Keep in mind that these alternatives may be less efficient than using a dedicated library like Lodash or implementing a deep copy algorithm yourself.

I hope this explanation helps you understand the benchmark and the options compared!

Related benchmarks:

Копи обжект (version: 0)

Comparing performance of: 1 vs 2

Created: 4 years ago by: Guest

Jump to the latest result

1

2

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):