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LiveLessons Scala for the Impatient

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LiveLessons Scala for the Impatient

LiveLessons Scala for the Impatient

English | Size: 463.52 MB (486,031,183 Bytes)
Category: CBTs


Lesson 1: Basic Scala starts by telling you the story behind Scala, and then you dive in and get to work. This lesson shows you how to use Scala worksheets for interactive evaluation of Scala code and how to work with values, variables, types, and functions. Then you will see how to navigate Scaladoc, the Scala documentation system. In the lab, you will plunge right in and explore the rich Scala library.

Lesson 2: Control Structures and Functionscovers how to implement branches and loops and how to loop over the elements of a collection. Then it turns to implementing your own functions and the conveniences that Scala provides, such as default and named arguments. The lesson ends with a lab in which you implement a useful function in many different ways. The answers section points out the pros and cons of the implementations and give you tips when to choose each approach.

Lesson 3: Arrays, Maps, and Tuplesexplains how to collect elements in data structures. In particular, you learn the equivalent of the Java collections such as arrays and maps. It shows you how to traverse and transform collections, and how to apply common algorithms to them. It then looks at tuples, a convenient mechanism for grouping values of different types that has no analog in Java. In the lab, you put the data structures and algorithms to work, solving common problems such as feature counting and clustering.

Lesson 4: OOP1-Classes and Objects discusses object-oriented programming in Scala. Scala is a hybrid language, and object-orientation is one of its cornerstones. If you dislike the boilerplate and ceremony that you need with classes and methods in Java, you are going to love what you see in this lesson: classes without the pain. You learn how to define classes and implement methods. In the lab, you explore how classes can evolve, while preserving a convenient interface for class users.

Lesson 5: OOP2-Packages, Inheritance, and Traitscovers advanced topic in object-oriented programming. You learn how the Scala syntax for packages and imports is more consistent and more convenient than the equivalent in Java. Then the lesson turns to inheritance and to traits, the Scala analog of interfaces. Like interfaces in Java 8, Scala traits can have methods, but they are even more dynamic than in Java. You explore some of their power in the lab.

Lesson 6: Functional Programming explains the fundamental concepts of functional programming. You learn how higher-order functions can consume and produce other functions, and why this is very useful. The lesson demonstrates how to process data with the map, filter, and reduce methods and how to build your own control structures. In the lab, you experience life without loops and analyze a complex data set entirely with higher-order functions. Then you build your own loop structure as a higher-order function.

Lesson 7: Case Classes and Pattern Matching covers the powerful concept of pattern matching. Pattern matching enables you to write complex branches in an intuitive and concise way. You learn about case classes classes with special features that make pattern matching work. As an example of case classes, you are introduced to the Option type, a better alternative to null values. The lesson ends by contrasting pattern matching with inheritance and polymorphism. In the lab, you put pattern matching and the Option type to work.




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