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

Overview

The benchmark compares two approaches to fetching values from an object: Object.values() and a cached array. The test creates two classes, Basic and Cached, which simulate these two approaches. Each class has methods to add key-value pairs to the object and retrieve the values using one of the two approaches.

What's being tested

The benchmark is testing the performance of these two approaches:

1. Fetching values via Object.values(): This approach involves calling the getValues() method on an object, which returns an array containing all the values in the object.
2. Fetching values via a cached array: This approach stores the added key-value pairs in an array and then returns this array when getValues() is called.

Options compared

The benchmark is comparing two options:

1. Object.values()
2. Cached array

Pros and cons of each approach:

1. Object.values():
   • Pros:
     • Easy to implement
     • Works with any object that has a values() method
   • Cons:
     • May be slower due to the overhead of calling a method on every iteration
     • May not perform well if the object is large or complex
2. Cached array:
   • Pros:
     • Can be faster for large or complex objects since it avoids the overhead of calling getValues()
     • Allows for caching and reuse of previously computed values
   • Cons:
     • Requires additional memory to store the cached array
     • May require more complex implementation to manage the cache

Library

In this benchmark, no external libraries are used. The Object.values() method is a built-in JavaScript method.

Special JS feature/syntax

The benchmark uses ES6 syntax (e.g., arrow functions, classes) and modern JavaScript features (e.g., template literals). If you're using an older version of JavaScript that doesn't support these features, you may need to modify the code accordingly.

Other alternatives

While Object.values() is a common approach for fetching values from an object, other alternatives include:

• Using a library like Lodash or Ramda to access object values
• Implementing your own custom solution for caching and retrieving values

In terms of benchmarking, you might also consider testing other approaches, such as:

• Using for...in loops instead of Object.values()
• Caching values in an array using a different data structure (e.g., Set)
• Comparing the performance of different caching strategies (e.g., least-recently-used, most-recently-used)

I hope this explanation helps!