Practice Best Practices (22.13) - Lambda Expressions and Functional Interfaces

Practice: Best Practices

Lesson 22.13Lambda Expressions and Functional Interfaces

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9 questions

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3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is a lambda expression?
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Think of it as a block of code you can pass around.
Question 2.
Why should one avoid complex logic in lambdas?
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Consider how this impacts understanding the code at a glance.
3Question 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.
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Consider their role in standardizing code.
4Question 4.
True or False: We should implement complex business logic within lambdas.
- True
- False
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Reflect on the purpose of using lambdas.
Question 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.
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Look for opportunities to define functions that encapsulate logic.
Question 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));.
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Identify the action being used in the lambda.

5 more questions in this section. Enroll free to practise them all.