22.13. Best Practices

Try these first

1. 1.

   What is a lambda expression?

   Hint

   Think of it as a block of code you can pass around.

2. 2.

   Why should one avoid complex logic in lambdas?

   Hint

   Consider how this impacts understanding the code at a glance.

3. 3.

   What is a key benefit of using built-in functional interfaces in Java?

   • They are configurable according to specific needs.
   • They enhance code readability and usability.
   • They reduce code redundancy.
   • They introduce complexity.

   Hint

   Consider their role in standardizing code.

4. 4.

   True or False: We should implement complex business logic within lambdas.

   • True
   • False

   Hint

   Reflect on the purpose of using lambdas.

5. 5.

   Given an existing lambda expression that checks if a number is even and calculates its square, refactor it to separate the checking logic from the squaring logic. Rewrite the code to follow best practices.

   Hint

   Look for opportunities to define functions that encapsulate logic.

6. 6.

   Convert a lambda expression that prints out contents of a list to use method reference syntax. Original: list.forEach(item -> System.out.println(item));.

   Hint

   Identify the action being used in the lambda.