Scala perguntas e respostas de entrevista
Pergunta 36. Explain currying in Scala.
Currying is the technique of transforming a function that takes multiple arguments into a series of functions that take one argument each. It is supported natively in Scala.
Pergunta 37. What is type inference in Scala?
Type inference is the ability of the Scala compiler to automatically deduce the data types of expressions, making it unnecessary to explicitly specify types in most cases.
Pergunta 38. How are implicits used in Scala?
Implicits are used for automatic type conversions, adding new methods to existing classes, and resolving ambiguities. They are a powerful and controversial feature in Scala.
Pergunta 39. What is the 'Future' class in Scala?
The 'Future' class represents a value or error computation that may be running asynchronously. It is commonly used for handling concurrent and parallel programming.
Pergunta 40. Explain the concept of variance in Scala.
Variance is a way to express how subtyping between more complex types relates to subtyping between their components. It is denoted by the use of 'covariant', 'contravariant', or 'invariant' keywords.
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?