Programming with Scala

In this course, participants will learn the specifics and features of the Scala language, its advantages and challenges.

The Scala programming language has been gaining popularity in recent years not only in the software development community, but also in enterprise development as well. Its benefits include the use of the most advanced features of contemporary programming languages and extensive support of functional programming.

Scala offers programmers an opportunity to improve development efficiency and create a very expressive and efficient code. Scala code is compiled to Java byte code and runs inside the JVM, which provides excellent compatibility with existing Java libraries and tools.

The course covers all the content that is necessary to effectively use Scala: operators and data types, using basic data structures such as arrays, map, tuples, the use of object-oriented and functional approach, working with collections, pattern matching, case-classes, generics and implicit conversions. It also include a large number of practical exercises.

Introduce developers to the Scala programming language.

Scala introduction

Scala instructions, operators and types

• Conditional statements
• Loops
• Functions
• Variables
• Operators
• Unit type
• Function type
• Null, Nothing, Any, AnyRef and AnyVal types
• Packages and imports
• Implicit imports
• Exceptions

Arrays, maps, tuples

• Creation, adding and removing array elements
• Access to Array Elements
• Arrays of fixed and variable length
• Multidimensional Arrays
• Operations with arrays
• Sorting an array
• Creating and accessing the associative tables
• Iteration, changing and sorting of associative tables
• Tuples
• Zipping

Classes and Inheritance

• Classes
• Properties with getters and setters
• Use parentheses method calls
• Properties with only getters
• Auxiliary constructors
• The primary constructor
• Nested classes
• Extending the class
• Overriding methods
• Type check and cast
• Call the superclass constructor
• Overriding fields
• Anonymous subclasses
• Abstract fields
• Constructor order and early definitions
• Scala Inheritance Hierarchy
• Objects equality

Objects

• Singletons
• Companion Objects
• Objects extending a class or trait
• Enumerations
• Packages objects
• Apply and unapply methods
• Lazy objects

Traits

• Traits as interfaces
• Traits with a specific implementation
• Redefine the abstract methods in the Traits
• Concrete and abstract fields in Traits
• Objects that use multiple Traits
• Trait construction order
• Initializing Trait fields
• Traits extending classes
• Self-types

Functions

• Functions as values
• Default arguments and named arguments
• Functions without a return value
• Anonymous functions
• Functions with Function as parameter
• Closures
• Functional Interfaces
• Currying
• Passing function as a parameter in the block of code
• Using return

Collections

• Traits collections in Scala: Map, Set and Seq
• Mutable and immutable collections
• Sequences
• Lists
• Mutable lists
• Sets
• Operators for working with collections
• Standard methods for working with collections
• Use map, reduce, fold and scan functions
• Zipping
• Iterators
• Data Streams
• Threadsafe Collections
• Parallel collections
• Interaction with Java collections

Pattern matching

• Pattern matching as a better switch
• Guards
• The variables in patterns
• Type patterns
• Matching arrays, lists and tuples
• Regular expressions
• Extractors
• Patterns in variable declarations
• Patterns in for expressions

Case classes, Option type and partial functions

• Сase classes
• Copy method and named parameters
• Sealed classes
• Option type
• Partial functions

Generics

• Generic сlasses
• Generic functions
• Type variance
• Upper and lower type bounds
• Use _ for type

Implicit conversions

• Using implicit keyword to define implicit type
• Import and use of implicit conversions
• Implicit parameters