A Beginner's Guide to Scala, Object Orientation and by John Hunt

By John Hunt

Scala is a brand new programming language built by way 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 methods with practical programming. even though a few familiarity with usual computing ideas is thought (such because the notion of compiling a application and executing this compiled shape, etc.) and with easy procedural language ideas (such as variables and allocation of values to variables) the early chapters of the booklet don't think any familiarity with item orientation nor practical programming. those chapters additionally step via different innovations with which the reader is probably not time-honored (such as checklist processing). From this historical past, John Hunt offers a pragmatic creation to item and sensible expertise utilizing Scala, one of many latest and best programming languages on hand. various recommendations 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 useful programming. scholars, and people actively taken with the software program will locate this accomplished advent to Scala and to item orientation and sensible programming, invaluable.

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Exe. bin type extension and can be run natively by the operating system). Instead a byte code file is a compressed version of your Scala code that is run via a virtual machine. This virtual machine acts like a computer that executes byte code files but is actually a software application that can be ported to numerous different operating systems. Scala can run on the Scala Virtual Machine (which is the Java Virtual Machine, or JVM allied with the Scala runtime libraries that provide for the various concepts, functionality and frameworks that Scala uses).

1 Introduction In the last chapter, you learned a little about the history of Scala and the Scala development environment. 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.

Note that the isDayOfWeek() method takes no parameters, it doesn’t need to as it and the date are part of the same thing. e. the integers day, month and year). Instead, they are forced to go via the internal methods. This may only seem a small step, but it is a significant one, nothing outside the object may access the data within the object. In contrast the data structure in the procedural version, is not only held separately to the procedures, the values for day, month or year could be modified directly without the need to use the defined procedures.

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