Scala perguntas e respostas de entrevista
Pergunta 1. Explain the concept of type bounds in Scala.
Type bounds restrict the possible types that can be used as type parameters. They include 'Upper bounds' denoted by <: and 'Lower bounds' denoted by >:.
Pergunta 2. What is the 'implicitly' method in Scala?
The 'implicitly' method is used to summon an implicit value of a given type. It is often used in implicit conversions and parameter injection.
Pergunta 3. What is the purpose of the 'case' keyword in Scala?
The 'case' keyword is used to define classes for pattern matching. It automatically generates equals, hashCode, and toString methods, making it suitable for use in pattern matching and collections.
Pergunta 4. Explain the concept of implicit conversions in Scala.
Implicit conversions allow the compiler to automatically convert one type to another if needed. They are defined using the 'implicit' keyword and are commonly used for enhancing existing types with new functionality.
Pergunta 5. What is the 'sealed' keyword used for in Scala?
The 'sealed' keyword is used to restrict the inheritance of a class to the same file. It helps the compiler exhaustively check pattern matches, ensuring that all possible subclasses are covered.
Mais uteis segundo os usuarios:
- What is a higher-order function?
- Explain the 'yield' keyword in Scala.
- Explain the difference between val and var in Scala.
- What is the purpose of the 'case' keyword in Scala?
- What are the advantages of using the 'Option' type over null in Scala?