Benchmark: mutating deep object with Lodash cloneDeep VS spread operator

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: 'a',
  myNumber: 123456789,
  myBoolean: true,
  child: {
    description: 'a',
    myNumber: 123456789,
    myBoolean: true,
    child_again: {
      description: 'a',
      myNumber: 123456789,
      myBoolean: true,
    },
  },
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject); myCopy.child.child_again.myBoolean = false
Spread operator
myCopy = { ...MyObject, child: { ...MyObject.child, child_again: { ...MyObject.child.child_again, myBoolean: false, } } };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what is tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Overview**

The benchmark compares two ways of creating a copy of an object in JavaScript: using Lodash's `cloneDeep` function and the spread operator (`...`). The test case creates a deep object with nested properties and then modifies one of these properties to verify which approach is faster.

**Lodash Clone Deep Function**

* Library: Lodash (a popular utility library for JavaScript)
* Purpose: Provides a recursive cloning function that can handle complex data structures, including arrays and objects.
* Pros:
	+ Handles deep object graphs with nested properties
	+ Can be used to create exact copies of objects, which is useful in certain scenarios
* Cons:
	+ Requires an additional external library (Lodash)
	+ May not be necessary for simple copying needs

**Spread Operator**

* Syntax: The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) as a way to create new arrays or objects by "spreading" the elements of an existing array or object.
* Pros:
	+ Built-in and doesn't require any additional libraries
	+ Efficient for simple copying needs
	+ Can be used with other methods, such as `Object.assign()`
* Cons:
	+ Only works for shallow copies (does not recursively clone objects)
	+ May not work correctly with certain data types or complex structures

**Other Considerations**

* **Performance**: The benchmark measures the execution speed of each approach. In this case, the spread operator appears to be faster.
* **Memory Usage**: The spread operator is generally more memory-efficient than Lodash's `cloneDeep`, as it doesn't create a new object graph and only copies the necessary properties.
* **Readability**: Using the spread operator can make code more concise and readable, especially when working with simple data structures.

**Benchmark Test Cases**

The test cases are designed to isolate specific aspects of each approach:

1. "Lodash cloneDeep" tests the `cloneDeep` function's performance on a deep object graph.
2. "Spread operator" tests the efficiency of using the spread operator for copying an object.

These test cases provide insight into which approach is faster and more suitable for different use cases.

**Alternative Approaches**

Other ways to create copies of objects in JavaScript include:

* `Object.assign()`: Copies the properties of one object to another.
* `JSON.parse(JSON.stringify(object))`: Creates a deep copy of an object by serializing it to JSON and then parsing it back.
* Manual iteration and property assignment: This approach can be more verbose but allows for fine-grained control over the copying process.

However, these alternatives may not be as efficient or convenient as using Lodash's `cloneDeep` or the spread operator.

Related benchmarks:

mutating deep object with Lodash cloneDeep VS spread operator (version: 0)

Comparing performance of: Lodash cloneDeep vs Spread operator

Created: 2 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Spread operator

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):