Benchmark: Lodash cloneDeep VS spread operator large object

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var MyObject = {
  description: 'a',
  myNumber: 123456789,
  myBoolean: true,
  hello: ['sdf','242','asdasdads'],
  yo: 'asd',
  by: '234234',
  hey: {
    ger: 'asdasd',
    hhj: ['1231', '123123']
  }
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Spread operator
myCopy = {...MyObject};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Spread operator

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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I'll break down the provided benchmark test case and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark tests two approaches to cloning a large JavaScript object:

1. **Lodash cloneDeep**: Uses the `_.cloneDeep` function from the Lodash library to create a deep copy of the `MyObject`.
2. **Spread operator**: Uses the spread operator (`{...}`) to create a shallow copy of the `MyObject`.

**Pros and Cons**

**Lodash cloneDeep**

Pros:

* Provides a way to create an exact, deep copy of the original object.
* Can handle complex nested structures.

Cons:

* Requires including an external library (Lodash).
* May have performance overhead due to the library's complexity.

**Spread operator**

Pros:

* Native support in modern JavaScript, reducing dependency on external libraries.
* Fast and efficient for shallow copies.

Cons:

* Only creates a shallow copy of the object, which might not be suitable for all use cases.
* Can lead to unexpected behavior if the target object is not an array or has complex nested structures.

**Other Considerations**

The benchmark uses a large `MyObject` with multiple nested properties and arrays. This helps to:

* Test the performance of both approaches on complex data structures.
* Identify potential issues with shallow copying, such as losing reference counts for objects.

**Library: Lodash.js**

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

**Special JS feature/Syntax: None**

The benchmark does not use any special JavaScript features or syntax that requires specific knowledge or configuration.

**Other Alternatives**

For creating copies of objects in JavaScript, other alternatives include:

* Using `JSON.parse(JSON.stringify(obj))`: Creates a shallow copy of an object by serializing the original object to a JSON string and then parsing it back into an object.
* Using `Object.assign()`: Creates a new object with copies of all properties from the original object.

Keep in mind that these alternatives may have their own trade-offs and limitations compared to using the spread operator or Lodash's `cloneDeep` function.

Related benchmarks:

Lodash cloneDeep VS spread operator large object (version: 0)

Comparing performance of: Lodash cloneDeep vs Spread operator

Created: 3 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Spread operator

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):