4.3.2. Key Features

Try these first

1. 1.

   What is a pure function?

   Hint

   Think about functions that can be tested in isolation.

2. 2.

   Explain immutability.

   Hint

   Consider why this might be beneficial in programming.

3. 3.

   What is a characteristic of a pure function?

   • It modifies global state
   • It always returns the same output for the same input
   • It's only useful in loops

   Hint

   Think about functions that can be tested easily.

4. 4.

   True or False: Lazy evaluation can improve performance.

   • True
   • False

   Hint

   Consider how not evaluating immediately can save resources.

5. 5.

   Create a simple program that demonstrates the concept of a pure function using any programming language of your choice. Explain why it is considered a pure function.

   Hint

   Ensure your function does not depend on any outside variables.

6. 6.

   Explain how a program utilizing lazy evaluation could perform differently than one that evaluates eagerly. Provide an example.

   Hint

   Consider scenarios where not all data needs to be processed immediately.