By John Hunt
Scala is a brand new programming language built by means of Martin Odersky and his staff on the EPFL. The identify Scala is derived from Sca(lable) La(nguage). Scala is a multi-paradigm language, incorporating item orientated ways with useful programming. even if a few familiarity with ordinary computing suggestions is believed (such because the thought of compiling a application and executing this compiled shape, etc.) and with easy procedural language thoughts (such as variables and allocation of values to variables) the early chapters of the e-book don't suppose any familiarity with item orientation nor sensible programming. those chapters additionally step via different thoughts with which the reader will not be popular (such as record processing). From this historical past, John Hunt presents a pragmatic creation to item and sensible expertise utilizing Scala, one of many most recent and finest programming languages on hand. numerous ideas are brought via sensible event taking the reader past the extent of the language syntax to the philosophy and perform of object-oriented improvement and practical programming. scholars, and people actively thinking about the software program will locate this accomplished creation to Scala and to item orientation and useful programming, worthwhile.
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Additional resources for A Beginner's Guide to Scala, Object Orientation and Functional Programming
That is, an object must possess a reference to another object in order to send it a message. 5. 30 4 Constructing an Object Oriented System Water bottle Switch Motor Fuse Pump Relay a Component (aPump) (aF use) ( a R e la y ) (aMotor) Switch Water bottle (aSwitch) ( a W a t e r b o t t le ) b Switch (aSwitch) Component (aPump) (aFuse) (aRelay) c Waterbottle Motor (aWaterbottle) (aMotor) Fig. 3 Comparison of components Fuse Instance variable state Services working? Relay state working? Motor state working?
In this chapter, you encounter a little of the Scala language, what happens when you compile and run a Scala program, the Scala Runtime (Virtual Machine) and the Scala IDE. 2 The Scala Environment There are a number of things that you need in order to develop using the Scala language. First of all you need access to the Scala compiler. The compiler is called scalac and you may use it from the command line to compile Scala code files directly or you may use it via an IDE (such as the Scala IDE) that can compile your code for you automatically.
3 Functional Programming 41 ship with the class that allows them to access the internals of a class (private fields and methods) and can provide the Scala equivalent of static behaviour. The class hierarchy in Scala is based on single inheritance of classes but allows multiple traits to be mixed into any given class. A Trait is a structure within the Scala language that is neither a class nor an interface (note Scala does not have interfaces even though it compiles to Java Byte Codes). It can however, be combined with classes to create new types of classes and objects.