Benchmark: Lodash cloneDeep vs array spread

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 = {...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.

**Benchmark Overview**

The provided benchmark compares two approaches to create a deep copy of an object in JavaScript: using the `_.cloneDeep()` method from Lodash and using the spread operator (`...`) on arrays.

**Options Compared**

Two options are compared:

1. **Lodash cloneDeep**: This approach uses the `_.cloneDeep()` method from Lodash, which creates a deep copy of an object by recursively cloning all its properties.
2. **Json clone**: This approach uses the spread operator (`...`) to create a shallow copy of an array, and then iteratively clones each property of the object using JSON.parse().

**Pros and Cons**

### Lodash cloneDeep

Pros:

* Creates a deep copy of the entire object, including nested objects and arrays.
* Handles circular references correctly.

Cons:

* Requires including Lodash as a dependency in your codebase.
* May have a performance overhead due to the use of recursion.

### Json clone

Pros:

* Does not require any external dependencies.
* Can be faster than Lodash's recursive cloning approach for very large objects.

Cons:

* Only creates a shallow copy of the object, and requires manual iteration to clone each property.
* May fail to handle circular references correctly.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for common tasks such as array manipulation, string manipulation, and object manipulation. The `_.cloneDeep()` method is specifically designed to create deep copies of objects, making it a convenient choice for this benchmark.

**Special JS Feature/Syntax: Spread Operator**

The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) as a way to expand an array into individual elements or merge two arrays into one. This feature is used in the "Json clone" approach to create a shallow copy of the object.

**Benchmark Preparation Code Explanation**

The script preparation code defines a JavaScript object `MyObject` with several properties, including nested objects and arrays. The `myCopy` variable is initialized to `null`. The benchmark definition scripts use either Lodash's `_.cloneDeep()` method or the spread operator (`...`) to create a copy of `MyObject`.

**Alternative Approaches**

Other approaches that could be used to compare in this benchmark include:

* Using the `JSON.parse()` and `JSON.stringify()` methods together to create a deep copy.
* Using a library like Immutable.js, which provides immutable data structures and functions for creating deep copies.
* Using a custom implementation of cloning, such as using recursion or iteration.

These alternative approaches would require modifications to the benchmark script preparation code and test cases.

Related benchmarks:

Lodash cloneDeep vs array spread (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):