Introductory racket: calling functions: composing functions.
Examples of expressions which compose their function-calls -- that is, take the result of one function-call and immediately feed them as inputs to a different function-call. Most examples in racket, but Java alluded to as well.
Related lecture page:
https://www.radford.edu/~itec380/2019...
[Note: "composing functions" can also mean the 'higher order' concept of creating a new function which, when later given an input, takes the result of calling one function with the input, and then feeding that result to another function. We'll talk about that later, but not in this video!]