Benchmark: Lodash cloneDeep vs Native Spread Test 1

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);
Spread
myCopy = { ...MyObject };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Spread

Fastest: N/A

Slowest: N/A

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

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Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition and Preparation Code**

The provided benchmark definition JSON represents a comparison between two approaches: using the `cloneDeep` function from Lodash (a popular utility library for functional programming in JavaScript) and using the spread operator (`{ ... }`) to create a deep copy of an object.

The preparation code defines an object `MyObject` with several properties, including nested objects and arrays. The variable `myCopy` is declared but not initialized; it will be used as the source object for the clone or spread operation.

**Options Compared**

Two options are compared:

1. **Lodash CloneDeep**: This approach uses the `cloneDeep` function from Lodash to create a deep copy of the `MyObject`. The purpose of this function is to recursively duplicate an entire object, including nested objects and arrays.
2. **Spread Operator (Native)**: This approach uses the spread operator (`{ ... }`) to create a shallow or deep copy of the `MyObject`, depending on how you interpret it. However, since JavaScript uses a "call-by-object" semantics, when spreading an object, it actually creates a new object with reference types preserved.

**Pros and Cons of Each Approach**

**Lodash CloneDeep**

Pros:

* Deep copying is guaranteed to work correctly for all types of objects.
* Recursively copies nested objects and arrays.

Cons:

* Requires Lodash library, which may not be present in every environment.
* Can be slower than the native spread operator if Lodash's internal logic isn't optimized.

**Spread Operator (Native)**

Pros:

* Faster and more lightweight compared to `cloneDeep`.
* Does not require a separate library.

Cons:

* May not work correctly for all types of objects, especially those with complex inheritance hierarchies.
* Preserves reference types in the copied object, which may lead to unexpected behavior if the original object is modified later.

**Other Considerations**

When using the spread operator, keep in mind that it creates a new object with reference types preserved. This means that if you use `Object.assign()` or other methods to modify the copied object, the changes will be reflected in both the original and copied objects.

If you need deep copying, consider using libraries like Lodash's `cloneDeep` or alternatives like JSON clone or a dedicated deep copying library.

**Library: Lodash**

Lodash is a popular utility library for functional programming in JavaScript. It provides various functions for working with arrays, objects, and other data structures. In this benchmark, the `cloneDeep` function is used to create a deep copy of an object.

**Special JS Feature or Syntax**

None mentioned explicitly in the provided code.

**Alternative Approaches**

If you don't want to use Lodash's `cloneDeep`, consider using alternatives like:

1. **JSON.parse(JSON.stringify(obj))**: This method can be used to create a deep copy of an object, but it has some limitations and may not work correctly for all types of objects.
2. **Recursion with Object.assign()**: You can write a recursive function that uses `Object.assign()` to create a new object with the desired properties.
3. **Dedicated deep copying libraries**: There are several dedicated libraries available, such as `deep-copy` or `jsonclone`, that provide more robust and efficient deep copying functionality.

Keep in mind that these alternatives may have different performance characteristics and may not be optimized for specific use cases.

Related benchmarks:

Lodash cloneDeep vs Native Spread Test 1 (version: 0)

Comparing performance of: Lodash cloneDeep vs Spread

Created: 5 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Spread

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):