Chapter 10

1. The main characteristics of functional programming are immutability (objects have states that do not change) and side-effect free functions (functions do not modify values or states outside their local scope). Advantages of functional programming include the following: first, the code is easier to understand and maintain because functions do not change states and only depend on the arguments they receive. Second, the code is easier to test for the same reason. Third, it is simpler and more efficient to implement concurrency because data is immutable and functions don't have side effects, which avoids data races.
2. A higher-order function is a function that takes one or more functions as arguments, returns a function, or both.
3. C# provides the ability to pass functions as arguments, return functions from functions, assign functions to variables, store them in data structures, define anonymous functions, nest functions, and test references to functions for equality...