Benchmark: Lodash cloneDeep vs ES6 spread

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Tests:

Lodash cloneDeep
let dummyObject = { "a": { "b": 1 , "c": 2 , "d": { "test": { "t": true } , "j": { "k": [1, 2, 3] , "l": [4, 5, 6] } , } , "e": [1, 2, 3, 4, 5, 6] , "f": 1 , "g": { "h": 1 , } } } const result = _.cloneDeep(dummyObject)
ES6 assign
let dummyObject = { "a": { "b": 1 , "c": 2 , "d": { "test": { "t": true } , "j": { "k": [1, 2, 3] , "l": [4, 5, 6] } , } , "e": [1, 2, 3, 4, 5, 6] , "f": 1 , "g": { "h": 12 , } } } const result = Object.assign({}, dummyObject)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
ES6 assign

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark compares the performance of two approaches for creating a deep copy of an object: Lodash's `cloneDeep` function and the ES6 spread operator (`Object.assign()`).

**What is being tested?**

In the first test case, `Lodash cloneDeep`, the benchmark creates a deeply nested object using JSON syntax and then uses Lodash's `cloneDeep` function to create a deep copy of this object. In the second test case, `ES6 assign`, the same object is created but instead of using `cloneDeep`, the ES6 spread operator (`Object.assign()`) is used to create a shallow copy (i.e., only the top-level properties are copied).

**Comparison of options**

The two approaches have different performance characteristics:

1. **Lodash's `cloneDeep` function**: This function creates a deep copy of the entire object, including all nested objects and arrays. This approach can be slower because it needs to recursively clone every property.
2. **ES6 spread operator (`Object.assign()`)**: This function only copies the top-level properties of the object and does not create a deep copy of nested objects or arrays. Instead, it creates a new shallow copy with references to the original values.

**Pros and cons of each approach**

1. **Lodash's `cloneDeep` function**:
	* Pros: Ensures a deep copy of the entire object, including all nested properties.
	* Cons: Can be slower due to recursive cloning.
2. **ES6 spread operator (`Object.assign()`)**:
	* Pros: Fast and efficient for shallow copies, especially for large objects with only top-level properties that need to be updated.
	* Cons: Does not create a deep copy of nested objects or arrays; may lead to unexpected behavior if the original object is modified.

**Library used**

The benchmark uses Lodash's `cloneDeep` function, which is a popular utility library for JavaScript. Its purpose is to provide a simple and efficient way to create deep copies of objects in JavaScript.

**Special JS feature/syntax**

There are no special JavaScript features or syntax mentioned in the benchmark. The focus is on comparing two different approaches for creating object copies.

**Alternative approaches**

Other alternatives for creating object copies include:

1. **JSON.parse(JSON.stringify())**: This method creates a deep copy of an object by serializing it to JSON and then parsing it back.
2. **Array.prototype.slice() + Object.assign()**: This approach creates a shallow copy of an array or object by using `slice()` to create a new shallow copy and then merging the two copies together with `Object.assign()`.
3. **for...in + Array.prototype.slice()**: This approach creates a deep copy of an object by iterating over its properties using `for...in` and creating a new copy for each property using `Array.prototype.slice()`.

These alternatives may have different performance characteristics depending on the specific use case, but they can be useful in certain situations.

Related benchmarks:

Lodash cloneDeep vs ES6 spread (version: 0)

Comparing performance of: Lodash cloneDeep vs ES6 assign

Created: 4 years ago by: Registered User

Jump to the latest result

Lodash cloneDeep

ES6 assign

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):