Let's break down what's being tested in this benchmark.

Overview

The benchmark compares the performance of two approaches: creating a new function using the new Function() constructor and defining a native function using an arrow function syntax ((d) => ...). The test cases measure how many executions per second each approach can perform on a simple mathematical operation involving logarithms.

What's being tested

The benchmark tests the performance of two different ways to create a function:

1. new Function(): This approach creates a new function using the Function constructor. The syntax is: var func = new Function('param1', 'return expression').
2. Native function definition: This approach defines a native function using an arrow function syntax ((param) => expression). In this case, the test uses the simple (d) => Math.log(2, d) syntax.

Options compared

The benchmark compares two options:

• new Function() (Option 1): Creates a new function dynamically at runtime.
• Native function definition using arrow functions (Option 2): Defines a native function that can be executed directly without the need for dynamic creation.

Pros and Cons of each approach:

1. new Function()
   • Pros:
     • Allows for more flexibility in defining custom functions with varying parameters.
     • Can be useful when working with legacy code or dynamic data.
   • Cons:
     • Performance overhead due to dynamic function creation at runtime.
     • May incur additional memory allocations and garbage collection.
2. Native function definition using arrow functions
   • Pros:
     • Faster execution performance since native functions are compiled by the JavaScript engine ahead of time.
     • Memory-efficient, as there's no additional allocation for a new function object.
   • Cons:
     • Less flexible than new Function(), as you're limited to defining functions with specific parameter names.

Library and special JS feature

There is no library or special JS feature being used in this benchmark. It only relies on standard JavaScript features, such as the Function constructor and arrow function syntax.

Alternative approaches

If you want to explore alternative approaches for creating functions in JavaScript:

1. Closure: You can define a closure by returning an expression from a higher-scoped function that captures variables from its surrounding scope.
2. Constructor functions: Instead of using the new Function() constructor, you can use a constructor function (e.g., class Func { ... }) to create new functions dynamically.

Keep in mind that these alternatives might have different performance characteristics compared to native function definition using arrow functions.