Benchmark: Lodash vs IMMUTABLE COPY

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.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:

Immutable
myCopy = Immutable.fromJS(MyObject).mergeDeep({ jayson: {parse: 'JSON.parse() method parses a JSON string... 2'}}).toJS()
Lodash
myCopy = _.merge(_.cloneDeep(MyObject), { jayson: {parse: 'JSON.parse() method parses a JSON string... 2'}})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Immutable
Lodash

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 benchmark and its results.

**Benchmark Overview**

The benchmark compares the performance of two approaches: Immutable Copying (using the Immutable.js library) and Lodash Merge Deep (using the Lodash library). The benchmark creates a sample object `MyObject` with nested properties, including an object `jayson` with methods for stringification and parsing. The objective is to copy this object using both libraries and measure the performance difference.

**Options Compared**

The two options being compared are:

1. **Immutable Copying**: Using the Immutable.js library to create a deep copy of `MyObject`, merge it with an updated version, and then convert the result back to a JavaScript object using `toJS()`.
2. **Lodash Merge Deep**: Using Lodash's `mergeDeep` function to merge the original `MyObject` with an updated version, which includes modified properties in the `jayson` object.

**Pros and Cons**

**Immutable Copying (Immutable.js)**

Pros:

* Provides a pure, immutable data structure, ensuring predictable behavior and thread-safety.
* Can be beneficial for concurrent programming or when working with shared data structures.

Cons:

* May incur additional overhead due to the creation of a new, separate data structure.
* Requires more memory allocation compared to Lodash's in-place merge.

**Lodash Merge Deep**

Pros:

* Offers an efficient, in-place merge operation that modifies the original object without creating a new one.
* Can be faster for large objects or when working with existing data structures.

Cons:

* May introduce side effects, such as modifying the original object, which can have unexpected consequences.
* Lodash's `mergeDeep` function has a higher number of method calls compared to Immutable.js's `fromJS` and `toJS` methods.

**Library Descriptions**

1. **Immutable.js**: A library for functional programming in JavaScript, providing immutable data structures and operations. Its primary goal is to ensure predictable behavior and thread-safety.
2. **Lodash**: A utility library for JavaScript, offering a wide range of functions for working with arrays, objects, and more.

**Other Considerations**

* The benchmark assumes that the `MyObject` has nested properties, which can lead to increased complexity when creating copies or merges.
* The use of `mergeDeep` in Lodash may not be necessary if the intent is to create a shallow copy. A simpler approach using `cloneDeep` might be sufficient.

**Alternatives**

Other alternatives for copying objects in JavaScript include:

1. **Array.prototype.slice()`: Creates a shallow copy of an array.
2. **Object.assign()**: Creates a shallow copy of an object, or merges two objects into one.
3. **JSON.parse(JSON.stringify(obj))`: Creates a deep copy of an object using JSON serialization.

However, these alternatives have their own trade-offs and may not provide the same level of immutability as Immutable.js or offer the same convenience as Lodash's `mergeDeep`.

Related benchmarks:

Lodash vs IMMUTABLE COPY (version: 0)

Lodash vs Immutable Copying

Comparing performance of: Immutable vs Lodash

Created: 5 years ago by: Guest

Jump to the latest result

Immutable

Lodash

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):