Benchmark: Lodash cloneDeep vs JSON Clone (alongside isEqual)

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,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject); _.isEqual(myCopy, MyObject);
Json clone
myCopy = JSON.parse(JSON.stringify(MyObject)); _.isEqual(myCopy, MyObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Json clone

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.

Let's break down the benchmark definition and test cases to understand what's being tested.

**Benchmark Definition**

The provided JSON represents a benchmark that compares two approaches for cloning an object: `Lodash cloneDeep` and `JSON Clone (alongside isEqual)`.

**Test Cases**

There are two individual test cases:

1. **Lodash cloneDeep**: This test case measures the performance of Lodash's `cloneDeep` function, which creates a deep copy of an object.
2. **Json clone**: This test case measures the performance of using `JSON.parse(JSON.stringify(MyObject))`, where `MyObject` is the original object being cloned.

**Options Compared**

The two options being compared are:

*   Lodash's `cloneDeep`: A library function that creates a deep copy of an object, preserving all its properties and nested objects.
*   `JSON.parse(JSON.stringify(MyObject))`: A method that converts a JavaScript value to a JSON string and then parses it back into a JavaScript object, which is then cloned.

**Pros and Cons**

Here are the pros and cons of each approach:

*   **Lodash cloneDeep**:
    *   Pros:
        *   Preserves all properties and nested objects.
        *   Can handle complex data structures like arrays and objects.
        *   Optimized for performance.
    *   Cons:
        *   Requires Lodash library, which may add overhead.
        *   May not be suitable for very large objects or high-performance applications.

*   `JSON.parse(JSON.stringify(MyObject))`:
    *   Pros:
        *   Lightweight and easy to implement.
        *   Works well for simple data structures like basic objects and arrays.
    *   Cons:
        *   Does not preserve all properties and nested objects (e.g., functions, undefined values).
        *   Can be slower than Lodash's `cloneDeep` due to the parsing step.

**Library and Its Purpose**

The Lodash library is a popular utility library for JavaScript that provides various helper functions. In this case, the `cloneDeep` function is used to create a deep copy of an object, which is essential for this benchmark.

**Special JS Feature or Syntax (None)**

There are no special features or syntax being tested in this benchmark. The focus is solely on comparing two approaches for cloning objects.

**Other Alternatives**

If you're interested in exploring alternative methods for cloning objects, here are a few:

*   **Object.assign()**: This method creates a new object with the properties of the original object.
*   **Spread operator (`{ ... }`)**: This can be used to create a shallow copy of an object by spreading its properties into a new object.
*   **For...of loop and `JSON.parse(JSON.stringify(MyObject))`**: A more explicit way to clone an object using a for...of loop and the `JSON.parse(JSON.stringify())` method.

These alternatives may have their own trade-offs in terms of performance, feature support, and ease of use.

Related benchmarks:

Lodash cloneDeep vs JSON Clone (alongside isEqual) (version: 0)

Comparing performance of: Lodash cloneDeep vs Json clone

Created: 6 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Json clone

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):