Let's break down the benchmark and explain what's being tested.

What's being tested: The benchmark is comparing two approaches to create a deep copy of a large object:

1. _.cloneDeep(MyObject) using Lodash
2. JSON.parse(JSON.stringify(MyObject))

These two methods are used to duplicate an object, which includes arrays and objects as properties.

Options compared:

• Lodash: A popular utility library for JavaScript that provides various functions for tasks like array manipulation, object cloning, and more.
  • Pros:
    • Well-maintained and widely adopted
    • Provides a simple and concise way to clone objects
  • Cons:
    • Adds an external dependency (Lodash)
    • May have performance implications due to the overhead of the library
• Native JSON.parse(JSON.stringify()): A built-in JavaScript method for cloning objects.
  • Pros:
    • No external dependencies or overhead
    • Native implementation, which is often faster than third-party libraries
  • Cons:
    • Not designed specifically for deep copying objects, which can lead to issues with circular references and complex data structures.

Other considerations:

• The benchmark uses a large object (MyObject) with 300,000 repeated strings (myNumber), nested objects (jayson), and other properties. This helps to stress the cloning mechanisms and demonstrate their performance differences.
• The Html Preparation Code includes a link to Lodash, which is necessary for the first test case.

Library used: Lodash (version 4.17.5) is used in the benchmarking process. It provides the _.cloneDeep() function, which creates a deep copy of an object.

Special JS feature or syntax: None mentioned in this specific benchmark.

Benchmark preparation code:

The code prepares two objects:

• MyObject: A nested object with various properties, including arrays and strings.
• myCopy: An empty variable that will receive the cloned object (or a new copy).

Individual test cases:

Two test cases are defined:

1. Lodash cloneDeep: Creates a deep copy of MyObject using Lodash's _.cloneDeep() function.
2. Json clone: Creates a deep copy of MyObject using the native JSON.parse(JSON.stringify()) method.

Latest benchmark result:

The latest results show that:

• Chrome 116, running on a Mac OS X 10.15.7 machine, executed the Lodash cloning function approximately 735,118 times per second.
• Chrome 116, running on the same machine, executed the JSON cloning function approximately 79,355 times per second.

Keep in mind that these results are specific to this particular benchmark and environment. The actual performance differences between these methods may vary depending on other factors, such as the specific use case, data size, and JavaScript engine being used.