Scala 面试题与答案
问题 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.
问题 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.
问题 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.
问题 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.
问题 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.
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