Benchmark: spread clone vs lodash

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);
es6 spread syntax
myCopy = {...MyObject};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash cloneDeep
es6 spread syntax

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.

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

**Benchmark Definition**

The benchmark is comparing two approaches to create a deep copy of an object:

1. **Lodash `cloneDeep` method**: This function creates a deep copy of an object by recursively cloning all its properties.
2. **ES6 spread syntax (`...`)**: This syntax creates a shallow copy of an object by copying only the top-level properties.

**Library Used**

The benchmark uses Lodash, a popular JavaScript utility library, which provides various functions for tasks like array manipulation, string manipulation, and more.

**Special JS Feature or Syntax**

The test cases use the ES6 spread syntax (`...`), which is a shorthand way to create a new object with the same properties as an existing object. This syntax was introduced in ECMAScript 2015 (ES6) and provides a concise way to create new objects without having to write explicit loops.

**Pros and Cons of Each Approach**

1. **Lodash `cloneDeep` method**:
	* Pros:
		+ Creates a deep copy of the entire object, including nested arrays and objects.
		+ More robust than the ES6 spread syntax in case of complex data structures.
	* Cons:
		+ Requires an external library (Lodash).
		+ Can be slower than the ES6 spread syntax due to the overhead of recursive cloning.
2. **ES6 spread syntax (`...`)**:
	* Pros:
		+ Fast and lightweight, as it only copies the top-level properties.
		+ Does not require an external library.
	* Cons:
		+ Only creates a shallow copy of the object, which may not be suitable for all use cases (e.g., if you need to preserve nested objects).
		+ May cause issues with circular references in the original object.

**Benchmark Preparation Code**

The preparation code sets up an object `MyObject` with various properties and a nested object `jayson`. The `myCopy` variable is initialized to `null`, which will be assigned the result of either the Lodash `cloneDeep` method or the ES6 spread syntax in the next step.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Lodash `cloneDeep` method**: Creates a deep copy of `MyObject` using the Lodash `cloneDeep` method.
2. **ES6 spread syntax**: Creates a shallow copy of `MyObject` using the ES6 spread syntax.

**Other Alternatives**

If you need to create a deep copy of an object, other alternatives to Lodash's `cloneDeep` method include:

* The `JSON.parse(JSON.stringify())` trick (although this creates a shallow copy and may not work as expected with complex data structures).
* A recursive function that manually clones the properties of the original object.
* Other libraries like `immutability` or `deepcopy`.

If you only need to create a shallow copy of an object, other alternatives include:

* The `Object.assign()` method (although this creates a new object and copies the top-level properties, but may not preserve nested objects).
* A simple loop that manually clones the properties of the original object.

Overall, the choice between these approaches depends on your specific use case and requirements.

Related benchmarks:

spread clone vs lodash (version: 0)

Comparing performance of: lodash cloneDeep vs es6 spread syntax

Created: 7 years ago by: Guest

Jump to the latest result

lodash cloneDeep

es6 spread syntax

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):