Let's break down the benchmark and analyze what's being tested, compared options, pros and cons of each approach, and other considerations.

Benchmark Definition

The benchmark measures the performance of three approaches for creating a deep copy of an object:

1. Lodash cloneDeep: Uses the cloneDeep function from the Lodash library.
2. Native structuredClone: Utilizes the structuredClone API introduced in modern JavaScript (ES2020) to create a deep copy.
3. Custom Deep Clone: Implements a custom function, deepClone, for creating a deep copy.

Comparison

The three approaches are being compared in terms of their performance. The benchmark prepares a sample object (MyObject) and then creates a deep copy of it using each approach. The test measures the number of executions per second (ExecutionsPerSecond) for each approach, which indicates how fast each method can create multiple copies.

Options

Here's an overview of each option:

• Lodash cloneDeep: Uses the cloneDeep function from Lodash to create a deep copy. This is a widely-used library that provides a variety of utility functions, including deep cloning.
  • Pros:
    • Well-tested and widely adopted
    • Provides other useful utilities beyond deep cloning
  • Cons:
    • Adds an external dependency (Lodash)
    • May not be optimized for performance compared to native implementations
• Native structuredClone: Utilizes the structuredClone API introduced in modern JavaScript (ES2020) to create a deep copy. This is a relatively new feature that provides a lightweight and efficient way to clone objects.
  • Pros:
    • Built-in, no external dependencies required
    • Optimized for performance
  • Cons:
    • Requires modern browsers or environments that support ES2020
• Custom Deep Clone: Implements a custom function (deepClone) for creating a deep copy. This approach requires manual implementation of the cloning logic.
  • Pros:
    • No external dependencies required
    • Can be optimized for performance if implemented carefully
  • Cons:
    • Requires manual implementation and testing
    • May not be as efficient or well-tested as established libraries like Lodash

Library

• Lodash: A popular utility library that provides a wide range of functions for tasks such as array manipulation, object transformation, and more. The cloneDeep function is one of its many utility functions.

Special JS Feature/Syntax

The benchmark uses the structuredClone API, which is a relatively new feature introduced in modern JavaScript (ES2020). This API provides a lightweight and efficient way to clone objects.

Other Considerations

When choosing an approach for creating deep copies, consider factors such as:

• Performance: How quickly does each method need to execute?
• Code complexity: How complex are the cloning logic implementations?
• Dependencies: Are there any external dependencies required (e.g., Lodash)?
• Browser support: Are modern browsers or environments required?

Alternatives

If you're looking for alternatives to these approaches, consider:

• JSON.parse(JSON.stringify(obj)): While not as efficient as deep copying methods, this approach can create a shallow copy of an object by serializing it as JSON and then parsing the resulting string.
• Array.prototype.slice() + Array.prototype.map(): This approach creates a shallow copy of an array by slicing it and mapping over the elements.