Cognitive load : fluent interfaces and friendly apis

a friendly robot, sitting down
Is your interface friendly?

To continue my mini series on cognitive load, following my previous post on static vs extension methods, a couple more examples to consider. Extension methods are often used as an entry point into a fluent interface, allowing a style which can be easier to read and eliminate the need for confusing, overly long parameter lists, multiple overloads or parameter objects.

They can also be used to humanize the interface, based on the understanding that the user experience of an API should be as important as the user experience of a website or application.

In the first example, I put together a quick concept for date comparison, to see if a fluent style is more readable than arithmetic operations on dates. Decide for yourself if that’s true. I discovered that making fluent operators is often harder than usual naming considerations, especially when the same word can be used to mean subtly different things.

In the second example, which I found fascinating, chaining is used to turn a conventional c# method into something more akin to a functional language with the intent of making the operations clearer and refocusing unnecessary interim storage steps. I’m not sure this is always the best approach, but I’ll definitely be adding these helper methods to my toolkit.

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