Chapter 12: Fully Functional – Embracing Functional Programming

1. What is functional programming?

• A style of programming in which state and business logic are expressed through pure mathematical operations without the use of shared state or side effects.

2. What are two beneficial characteristics of functional programming?

• Reduction in state management
• Limiting of side effects

3. What does an inline modifier do to a defined function?

• It indicates that the compiler should include the function's implementation at the functional call site to improve the performance characteristics of the code.

4. Is it true or false that higher-order functions pose a potential performance issue?

• True

5. Can you name three functions from the Kotlin standard library?

• map()
• filter()
• orEmpty()
• first()
• last()

6. What is the Arrow library used for?

• It's used as a framework for writing purely functional code in Kotlin.

7. What are the core data types when writing functional code with Arrow?

• Typeclasses
• Data types
• Effects