1.9 - Best Practices
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Practice Questions
Test your understanding with targeted questions
What is a lambda expression?
💡 Hint: Think about shorthand function implementations.
What does the Optional class help prevent?
💡 Hint: Consider how you handle null values.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is a lambda expression?
💡 Hint: It's related to functional interfaces.
True or False: Optional helps manage nullable values.
💡 Hint: Think about what happens when a variable is null.
3 more questions available
Challenge Problems
Push your limits with advanced challenges
Create a function that takes a list of strings and returns a list containing only those that have more than 3 characters. Use streams.
💡 Hint: Use the `filter()` method correctly.
Write a pure function that accepts a list of integers and returns the sum, ensuring it does not alter the original list.
💡 Hint: Think about how to use reduce without modifying input.
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