> functional programming is about functions different people mean different things when referring to functional programming. Some people believe that function

> functional programming is about functions different people mean different things when referring to functional programming. Some people believe that functional programming are using higher-order functions like `map`, `reduce`, `forEach`, etc, which takes a function as a parameter, instead of doing imperative loops. Some people, in addition to above, believe that functional programming is about creating functions that take a certain 'shaped' parameters, to allow for automatic checking. And lastly, the "real" functional programmers are people who believe in referential transparency in your functional program.