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

The test consists of three individual microbenchmarks that measure the performance of different JavaScript iteration methods:

1. _.each(value, function(v,i) {return v}): This benchmark uses the Lodash library to iterate over an array using the each method.
2. _.map(value, function(v,i) {return v}): This benchmark also uses the Lodash library to iterate over an array using the map method.
3. value.forEach(function(v,i) {return v}): This benchmark tests the native forEach method of JavaScript arrays.

Lodash Libraries

In this benchmark, two libraries are used:

• lodash (version 4.17.10): A popular utility library that provides a set of functional programming helpers.
• The Lodash each and map methods are used to iterate over the value array.

Native JavaScript Methods

The native forEach method is tested as well, which is part of the ECMAScript standard and does not require any libraries or additional setup.

Benchmark Options Compared

In this benchmark, three options are compared:

• Lodash's each method
• Lodash's map method
• Native JavaScript's forEach method

Each option has its pros and cons:

• Lodash's each and map methods: These methods provide a convenient way to iterate over arrays using functional programming principles. However, they may introduce additional overhead due to the creation of new arrays (in the case of map) or additional memory allocations. Additionally, since these functions are part of the Lodash library, users need to include the library in their codebase.
• Native JavaScript's forEach method: This is a lightweight and efficient way to iterate over arrays, as it does not require any additional memory allocations or creation of new data structures. However, it may be less convenient than using higher-order functions like each and map, especially for developers unfamiliar with these methods.

Other Considerations

• The benchmark measures the performance of each option by executing a simple expression (return v) over an array of values. This is a simplified test case that does not cover all possible scenarios, so results should be interpreted with caution.
• The benchmark uses Chrome 80 as the test browser and Mac OS X 10.15.3 as the operating system. Results may vary on other platforms or browsers.

Alternatives

If you're interested in exploring alternative iteration methods for your own use cases, consider the following:

• Array.prototype.reduce(): This method is another common way to iterate over arrays using a callback function.
• **Array.prototype.filter()`: This method can be used as part of an iterative solution to filter elements from an array.
• Generator functions: For modern JavaScript environments (ES6+), consider using generator functions to iterate over arrays or other data structures.

Keep in mind that the choice of iteration method depends on your specific use case, performance requirements, and personal preference.