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What is self-type Scala?
Self-types are a way to declare that a trait must be mixed into another trait, even though it doesn’t directly extend it. That makes the members of the dependency available without imports. A self-type is a way to narrow the type of this or another identifier that aliases this .
What is the use of trait in Scala?
Traits are used to share interfaces and fields between classes. They are similar to Java 8’s interfaces. Classes and objects can extend traits, but traits cannot be instantiated and therefore have no parameters.
What is inheritance in Scala?
Inheritance is an important pillar of OOP(Object Oriented Programming). It is the mechanism in Scala by which one class is allowed to inherit the features(fields and methods) of another class. The subclass can add its own fields and methods in addition to the superclass fields and methods.
What is cake pattern in Scala?
It’s called the Cake pattern, a sort of dependency injection mechanism that uses only idiomatic Scala constructs. The cake pattern represents the most important use of the self-type annotation in Scala. The pattern defines two different aspects of dependency management. The first is how to declare a dependency.
What is trait in Scala with example?
In scala, trait is a collection of abstract and non-abstract methods. You can create trait that can have all abstract methods or some abstract and some non-abstract methods. A variable that is declared either by using val or var keyword in a trait get internally implemented in the class that implements the trait.
What is MacWire?
MacWire generates new instance creation code of given classes, using values in the enclosing type for constructor parameters, with the help of Scala Macros. MacWire helps to implement the Dependency Injection (DI) pattern, by removing the need to write the class-wiring code by hand.
How do I type in Scala?
Scala is a statically typed programming language. This means the compiler determines the type of a variable at compile time. Type declaration is a Scala feature that enables us to declare our own types.