Let's dive into the explanation of the provided benchmark.

What is being tested?

The benchmark tests two different approaches to convert a JavaScript primitive value (parentId) to a string:

1. String(): This method uses the built-in String constructor to convert the value to a string. It takes ownership of the original value, which means it creates a new string object and copies the original value into it.
2. JSON.stringify(): This function converts an arbitrary JavaScript value to a JSON string. In this case, it's used to convert the parentId primitive value to a string.

Options compared

The benchmark compares the performance of these two approaches:

• String() (native method)
• JSON.stringify() (built-in function)

Pros and Cons:

• String(): Pros:
  • Fast execution time, as it's a native method.
  • Lightweight, as it doesn't create an additional object. Cons:
  • May not work correctly for non-primitive values or complex objects.
  • May be less readable than using the built-in function.
• JSON.stringify(): Pros:
  • Works with any JavaScript value, including complex objects.
  • Can be more readable than using the native method. Cons:
  • Slower execution time compared to String().
  • Creates an additional object in memory.

Library or special JS feature

There is no specific library used in this benchmark. However, JSON.stringify() uses the ToString method on the value being converted, which is a built-in JavaScript method.

Special JS features or syntax (not applicable)

No special JavaScript features or syntax are used in this benchmark.

Other alternatives

Other alternatives to use when converting primitive values to strings include:

• Using template literals (${value}) or concatenation (value + '')
• Using the toJSON() method (not applicable for primitives)
• Implementing a custom conversion function

Keep in mind that these alternatives might have different performance characteristics and usage scenarios compared to the built-in String() and JSON.stringify() methods.

Benchmark preparation code

The provided script preparation code defines a simple test data function makeTestData(), which returns the string 'parentId'. This code is used to generate test data for each benchmark case.