Domain Modeling Made Functional

Functions Are Things

In the functional programming paradigm, functions are things in their own right. And if functions are things, then they can be passed as input to other functions:

Or they can be returned as the output of a function:

Or they can be passed as a parameter to a function to control its behavior:

Treating functions as things opens up a world of possibilities. It’s hard to get your head around at first, but you can already see that even ...