Benchmark: spread clone vs lodash cloneDeep vs JSON

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: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  deeperObj: {
    deep: {
    	deeper: 'HELLO'
    },
    is: {
    	this: {
        	working: '?'	
        }
    }
  }
};

var myCopy = null;

Tests:

lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
es6 spread syntax
myCopy = {...MyObject};
JSON stringify
JSON.parse(JSON.stringify(MyObject));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash cloneDeep
es6 spread syntax
JSON stringify

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation.

**Benchmark Definition**

The benchmark defines three test cases:

1. **Lodash Clone Deep**: This test case uses the `_.cloneDeep` function from the Lodash library to create a deep copy of the `MyObject`. The purpose is to measure the performance of cloning an object using this method.
2. **ES6 Spread Syntax**: This test case uses the spread syntax (`{...MyObject}`) to create a shallow copy of the `MyObject`. The goal is to measure the performance of cloning an object using this feature introduced in ES6.
3. **JSON Stringify**: This test case uses the `JSON.parse(JSON.stringify(MyObject))` method to create a deep copy of the `MyObject`. The purpose is to measure the performance of cloning an object using JSON serialization.

**Options Compared**

The benchmark compares three different approaches:

1. Lodash Clone Deep
2. ES6 Spread Syntax
3. JSON Stringify

Each approach has its pros and cons:

* **Lodash Clone Deep**: Pros: This method provides a robust way to clone objects, handling complex cases like arrays with nested objects. Cons: It requires an external library (Lodash) and may introduce additional overhead due to the library's execution.
* **ES6 Spread Syntax**: Pros: This method is simple and widely supported, as it's part of the ES6 standard. Cons: It only creates a shallow copy, which might not be sufficient for all use cases, especially when dealing with complex objects or arrays.
* **JSON Stringify**: Pros: This method is lightweight and doesn't require any additional libraries. Cons: It can lead to issues when working with non-JSON data structures (e.g., strings, functions) and may not handle cycles correctly.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of helper functions for various tasks, including array manipulation, object creation, and more. The `_.cloneDeep` function specifically creates a deep copy of an object or array, handling complex cases like nested objects and arrays.

**Special JS Feature: ES6 Spread Syntax**

The ES6 spread syntax (`{...MyObject}`) is a feature introduced in the ECMAScript 2015 standard. It allows you to create a new object by spreading the properties of an existing object onto a new object. This approach creates a shallow copy, as only the top-level properties are copied.

**Other Considerations**

When choosing between these approaches, consider the following factors:

* **Complexity**: If your objects have complex structures (e.g., nested arrays, objects), Lodash Clone Deep or JSON Stringify might be more suitable.
* **Weight**: If you're concerned about library overhead, ES6 Spread Syntax is a lightweight alternative.
* **Compatibility**: Ensure that your target browsers support the chosen approach.

**Alternatives**

If you don't like using Lodash, you can explore other alternatives for creating deep copies:

1. `Array.prototype.slice.call()`: Creates a shallow copy of an array.
2. `Object.assign()`: Creates a shallow copy of an object.
3. `JSON.parse(JSON.stringify())` (again): Creates a deep copy of an object using JSON serialization.

However, keep in mind that these alternatives might not be as robust or efficient as Lodash Clone Deep or the ES6 Spread Syntax approach.

I hope this explanation helps!

Related benchmarks:

spread clone vs lodash cloneDeep vs JSON (version: 0)

Comparing performance of: lodash cloneDeep vs es6 spread syntax vs JSON stringify

Created: 7 years ago by: Guest

Jump to the latest result

lodash cloneDeep

es6 spread syntax

JSON stringify

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):