By John Hunt
Scala is a brand new programming language built by means of Martin Odersky and his crew on the EPFL. The identify Scala is derived from Sca(lable) La(nguage). Scala is a multi-paradigm language, incorporating item orientated techniques with practical programming. even if a few familiarity with regular computing thoughts is thought (such because the concept of compiling a application and executing this compiled shape, etc.) and with easy procedural language options (such as variables and allocation of values to variables) the early chapters of the publication don't imagine any familiarity with item orientation nor useful programming. those chapters additionally step via different thoughts with which the reader will not be conventional (such as record processing). From this historical past, John Hunt offers a pragmatic creation to item and practical expertise utilizing Scala, one of many most modern and best programming languages to be had. quite a few ideas are brought via useful event taking the reader past the extent of the language syntax to the philosophy and perform of object-oriented improvement and sensible programming. scholars, and people actively concerned about the software program will locate this finished creation to Scala and to item orientation and sensible programming, necessary.
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Additional resources for A Beginner's Guide to Scala, Object Orientation and Functional Programming
Wiper motor Relay Fuse 1. working? 3. working? working? Pump 4. extract(pump status) Water bottle Fig. 4 Collaborations between the objects for wash operation If the pump is working, then the pump object sends the final message to the water bottle 4. pump sends a message extract to the water bottle In step four, a parameter is passed with the message because, unlike the previous messages that merely requested state information, this message requests a change in state. The parameter indicates the rate at which the pump draws water from the water bottle.
The Scala interpreter evaluated the expression and printed out the result. The result (res0) indicates that the result is an Int (integer) of the value 5. This is because we entered an expression that returned a result. 2. Here you can see that the result is that the string is printed out. To leave the Scala interpreter shell use CTRL-D or use the command exit. 4 The Scala IDE 45 Fig. 4 The Scala IDE You will need a Scala environment on your local machine in order to develop, compile, test and run Scala applications.
1 Packages Versus Classes It has been argued (to me at least) that a package is just like a class. It provides a template from which you can create executable code, it provides wall around your data with well defined gateways etc. However, there are a number of very significant differences between packages and classes. Firstly, packages tend to be larger (at least conceptually) units than classes. For example, the TextIO package in Ada is essentially a library of textual IO facilities, rather than a single concept such as the class String in C#.