Benchmark: Lodash cloneDeep vs double 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 testArray = [{
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  },
  testArray: [{
    myName: 'test name',
    myNumber: 123245
  }]
},{
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  },
  testArray: [{
    myName: 'test name',
    myNumber: 123245
  }]
}];

var testCopy = null;

var deepClone = function(obj) {
   var out;
    if (Array.isArray(obj)) {
        out = [];
        for (var index = 0; index < obj.length; ++index) {
            let subArray = obj[index];
            out.push((subArray === null) ? subArray : (subArray instanceof Date) ? new Date(subArray.valueOf()) : (typeof subArray === 'object') ? deepClone(subArray) : subArray);
        }
    } else {
        out = {};
        for (var key in obj) {
            var subObject = obj[key];
            out[key] = subObject === null ? subObject : subObject instanceof Date ? new Date(subObject.valueOf()) : (typeof subObject === 'object') ? deepClone(subObject) : subObject;
            
           
        }
    }
    return out;
};

Tests:

Lodash cloneDeep
testCopy = _.cloneDeep(testArray);
Double spread operation
testCopy = {...testArray, testObject: {...testArray.testObject}}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Double spread operation

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided JSON represents a JavaScript microbenchmark test case, specifically comparing the performance of two object cloning methods: Lodash's `cloneDeep` function and double spread operation.

**Test Case 1: Lodash cloneDeep**

In this test case, the script prepares an array of objects (`testArray`) with nested properties, including arrays. The `cloneDeep` function from Lodash is then used to create a deep copy of the entire `testArray`. This method recursively clones all nested objects and arrays.

**Test Case 2: Double Spread Operation**

In this test case, the script uses the double spread operation (also known as rest parameter spreading) to create a new object that contains all properties from the original `testArray`, including nested objects and arrays. The resulting object is then assigned to the `testCopy` variable.

**Comparison of Options**

1. **Lodash cloneDeep**: This method provides a robust and efficient way to clone complex objects with nested properties. It handles various types of data, such as dates, numbers, and objects, correctly.
	* Pros:
		+ Robustness in handling complex data structures
		+ Easy to use and maintain
	* Cons:
		+ Requires including the Lodash library in the project (depending on the version)
2. **Double Spread Operation**: This method uses JavaScript's rest parameter spreading feature to create a new object with all properties from the original array.
	* Pros:
		+ Lightweight and does not require additional libraries
		+ Easy to implement
	* Cons:
		+ May not work correctly for deeply nested objects or arrays
		+ Can be slower than Lodash's `cloneDeep` due to its simplicity

**Library: Lodash**

Lodash is a popular JavaScript library that provides various utility functions, including `cloneDeep`. The `cloneDeep` function recursively clones all properties of an object, ensuring that nested objects and arrays are properly copied.

**Special JS Feature or Syntax: Double Spread Operation**

The double spread operation (rest parameter spreading) was introduced in ECMAScript 2015 (ES6). It allows you to use the syntax `{...obj}` to create a new object with all properties from an existing object, `obj`.

**Alternative Methods**

Other alternatives for cloning objects or arrays include:

* `Array.prototype.slice()`: Creates a shallow copy of an array.
* `Object.assign()`: Creates a shallow copy of an object.
* `JSON.parse(JSON.stringify(obj))`: Creates a deep copy of an object.

Related benchmarks:

Lodash cloneDeep vs double spread (version: 0)

compare object clone methods where single level of recursion is needed

Comparing performance of: Lodash cloneDeep vs Double spread operation

Created: 3 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Double spread operation

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):