Benchmark: Lodash cloneDeep vs JSON Clone vs Eval

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);
Json clone
myCopy = JSON.parse(JSON.stringify(MyObject));
Eval
myCopy = eval('(' + JSON.stringify(MyObject) + ')')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Json clone
Eval

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.

Measuring the performance of different approaches to clone or copy an object in JavaScript can be a useful benchmark.

**Benchmarked Methods**

The provided JSON represents three test cases:

1.  **Lodash `cloneDeep` Method**: This method creates a deep copy of an object, which means it recursively copies all properties and their corresponding values.
    *   Pros:
        *   More accurate for complex objects with nested structures
        *   Handles arrays and objects with cyclic references correctly
    *   Cons:
        *   May be slower due to the recursive nature of the method
2.  **JSON `parse` Method**: This method converts a JSON string into a JavaScript object, which can then be used as a copy.
    *   Pros:
        *   Fast and lightweight
        *   Suitable for simple objects with no nested structures
    *   Cons:
        *   Does not handle arrays or objects with cyclic references correctly
3.  **`eval` Function**: This function executes a string containing JavaScript code, which can be used to create a copy of an object.
    *   Pros:
        *   Allows for the creation of complex copies
    *   Cons:
        *   Potentially vulnerable to security issues due to the execution of arbitrary JavaScript code
        *   Slow and less efficient than other methods

**Library**

The `lodash` library is used in the benchmark. It provides a convenient way to clone deep objects with its `cloneDeep` method.

**Special JS Feature/Syntax**

None mentioned in this explanation. However, it's worth noting that the use of `eval` function can be considered a special JavaScript feature due to its ability to execute arbitrary code.

**Alternatives**

If you're looking for alternative methods to clone or copy objects in JavaScript, consider the following:

1.  **`.slice()` Method**: Creates a shallow copy of an array or object.
2.  **`.Object.assign()` Method**: Copies the values of one or more source objects into a new object.
3.  **`JSON.parse(JSON.stringify(obj))`**: Similar to `JSON.parse`, but uses `JSON.stringify` to create a deep copy of the original object (note that this method is specific to JSON parsing).

For complex objects, you may need to use a library like Lodash or implement your own recursive cloning function.

**Additional Considerations**

When choosing an approach for cloning or copying objects in JavaScript, consider factors such as:

*   Complexity of the object
*   Performance requirements
*   Security concerns (e.g., using `eval` can be risky)
*   Compatibility with older browsers or environments

Related benchmarks:

Lodash cloneDeep vs JSON Clone vs Eval (version: 0)

Comparing performance of: Lodash cloneDeep vs Json clone vs Eval

Created: 6 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Json clone

Eval

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):