Overview of the Benchmark

The provided benchmark compares three methods for creating a deep copy of an object: Lodash's cloneDeep, JSON's parse and stringify methods, and the structuredClone function.

What is being tested?

In this benchmark, we're testing the performance of each method in creating a deep copy of a complex object with nested properties. The object includes an array, a boolean, and another object with its own properties.

Options Compared:

1. Lodash CloneDeep: Uses Lodash's cloneDeep function to create a deep copy of the original object.
2. JSON Clone: Uses JSON's parse and stringify methods to create a deep copy of the original object. This involves converting the object to a JSON string, parsing it back into an object, and then cloning it.
3. structuredClone: Uses the structuredClone function (introduced in ECMAScript 2020) to create a deep copy of the original object.

Pros and Cons:

1. Lodash CloneDeep:
   • Pros: Efficient and widely supported by Lodash users.
   • Cons: Requires including an additional library dependency (Lodash).
2. JSON Clone:
   • Pros: Lightweight and doesn't require any external dependencies.
   • Cons: Involves extra overhead of converting to and from a JSON string, which may impact performance.
3. structuredClone:
   • Pros: Part of the ECMAScript standard, so it's supported by all modern browsers.
   • Cons: May not be supported in older browsers or environments.

Library Used:

In this benchmark, Lodash is used as a dependency for the cloneDeep function.

Special JS Feature/Syntax:

The structuredClone function is a new feature introduced in ECMAScript 2020. It's designed to create a deep copy of an object without using any external dependencies or modifying the original object.

Benchmark Preparation Code Explanation:

The script preparation code defines an object MyObject with nested properties, including an array and a boolean. The HTML preparation code includes a link to the Lodash library for use in the benchmark.

Individual Test Cases:

Each test case uses a different method to create a deep copy of the original object:

1. Lodash CloneDeep: Uses _.cloneDeep(MyObject) to create a deep copy.
2. JSON Clone: Uses JSON.parse(JSON.stringify(MyObject)) to create a deep copy.
3. structuredClone: Uses structuredClone(MyObject) to create a deep copy.

Other Alternatives:

If you need to compare other methods for creating deep copies, some alternatives could be:

• Using Object.assign() with the spread operator (...) to create a shallow copy, and then using Object.assign() again to create a deep copy.
• Using a custom function that recursively clones each property of the original object.
• Using a library like Immutable.js or Ramda for creating immutable copies.

However, these alternatives are not part of the benchmark being discussed.