Practice Best Practices (1.9) - Functional Programming in Java

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11 questions

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6 sample questions

Question 1.
What is a lambda expression?
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Think about shorthand function implementations.
Question 2.
What does the Optional class help prevent?
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Consider how you handle null values.
3Question 3.
What is a lambda expression?
- A way to declare a variable
- A shorthand representation of a method
- A type of collection
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It's related to functional interfaces.
4Question 4.
True or False: Optional helps manage nullable values.
- True
- False
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Think about what happens when a variable is null.
Question 5.
Create a function that takes a list of strings and returns a list containing only those that have more than 3 characters. Use streams.
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Use the `filter()` method correctly.
Question 6.
Write a pure function that accepts a list of integers and returns the sum, ensuring it does not alter the original list.
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Think about how to use reduce without modifying input.

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