What is namespace in Scala?

What is namespace in Scala?

Scala uses packages to create namespaces that let you modularize programs and help prevent namespace collisions. Scala supports the package-naming style used by Java, and also the “curly brace” namespace notation used by languages like C++ and C#.

What is a package in Scala?

Package in Scala is a mechanism to encapsulate a group of classes, sub packages, traits and package objects. It basically provides namespace to put our code in a different files and directories. Packages is a easy way to maintain our code which prevents naming conflicts of members of different packages.

How do I use Scala packages?

Click on file, new then scala project and give it a name. To define a package in Scala you use the keyword package that is then followed by name of the package. To package your code you create a Scala object (. scala) and place it there then store it in your preferred folder in project structure.

What is scope in Scala?

Scala variables are categorized into three scopes depending on the place where they get declared. They are fields, method parameters and local variables. Let us discuss these one by one.

What is the difference between scala class and object?

Difference Between Scala Classes and Objects Definition: A class is defined with the class keyword while an object is defined using the object keyword. Also, whereas a class can take parameters, an object can’t take any parameter. Instantiation: To instantiate a regular class, we use the new keyword.

What are literals in scala?

The literals are a series of symbols utilized for describing a constant value in the code. There are many types of literals in Scala namely Character literals, String literals, Multi-Line String literals, Boolean literals, Integer literals, and Floating point literals.

What is 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.

What is type alias in Scala?

Type aliases are a useful way to refer to existing types with a local, specific name. A Tuple2[Int,String] used regularly inside a class may be more useful if it were named UserInfo . However, as with other advanced type features, type aliases should not replace careful object-oriented design.

How do I package a Scala code?

Writing Scala code

1. On the Project panel on the left, expand SbtExampleProject => src => main.
2. Right-click scala and select New => Package.
3. Name the package example and click OK (or just press the Enter or Return key).

What is the difference between Scala class and object?

What is private [] in Scala?

In Scala,private[this] is object private,which makes sure that any other object of same class is unable to access private[this] members. Example.

What is block in Scala?

Blocks in Scala It contains a sequence of definitions or expressions. The last element of a block is an expression that defines its value. This return expression can be preceded by auxiliary definitions. Blocks are themselves expressions; a block may appear everywhere an expression can.

What is a singleton in Scala?

Instead of static keyword Scala has singleton object. A Singleton object is an object which defines a single object of a class. A singleton object provides an entry point to your program execution. If you do not create a singleton object in your program, then your code compile successfully but does not give output.

What is the difference between class and case class in Scala?

Points of difference between Case Class and Class in Scala The case class is defined in a single statement with parameters (syntax for defining case class) whereas the normal class is defined by defining method and fields (syntax for defining class).

What is the difference between literals and data types?

Data types are those which specify the type of data represented by the variable and literal is the that is stored in to the variable. A literal is a source code representation of a fixed value. They are represented directly in the code without any computation.

What are the data types in Scala?

Scala – Data Types

What is alias in Scala?

Type Alias A type alias is usually used to simplify declaration for complex types, such as parameterized types or function types. Let’s explore examples of those aliases and also look at some illegal implementations of type aliases.

What is Self in Scala?

Language. 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 are types in Scala?

Scala Type Hierarchy AnyVal represents value types. There are nine predefined value types and they are non-nullable: Double , Float , Long , Int , Short , Byte , Char , Unit , and Boolean . Unit is a value type which carries no meaningful information.