Mastering Functional Programming

Programming to capabilities

Imagine you are writing an application that is to be executed against more than one environment. Such scenarios are common in the real world. A good example is mobile applications. You can have multiple mobile platforms. However, you would like to publish your applications to all of them. The platforms that exist are quite different from each another. And usually, it is pretty tedious to reimplement your application for every platform separately. So, you would like to write our application once, and somehow make it run against all of the platforms that currently exist.

Another example is programming server-side software that should work against a wide variety of configurations. For example, the same server-side ...