By John Hunt
Scala is a brand new programming language built via Martin Odersky and his workforce 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 supposing a few familiarity with normal computing thoughts is believed (such because the notion of compiling a software and executing this compiled shape, etc.) and with simple procedural language recommendations (such as variables and allocation of values to variables) the early chapters of the ebook don't imagine any familiarity with item orientation nor useful programming. those chapters additionally step via different suggestions with which the reader will not be established (such as checklist processing). From this heritage, John Hunt offers a pragmatic advent to item and practical expertise utilizing Scala, one of many most modern and best programming languages on hand. a number of strategies are brought via functional adventure 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 focused on the software program will locate this complete creation to Scala and to item orientation and practical programming, invaluable.
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Extra resources for A Beginner's Guide to Scala, Object Orientation and Functional Programming
Sample text
This is a little contrived and loses the structure of the underlying system. It also loses any modularity in the system. That is, if we want to add new components then we have to change the pump object, even if the new components only affect the switch. This approach also indicates that the developer is thinking too procedurally and not really in terms of objects. In an object-oriented view of the system, the pump object only needs to know the state of the relay. It should therefore request this information from the relay.
This is a hint that these objects may have something in common. Each of them presents the same interface to the outside world. If we then consider their attributes, they all possess a common instance variable. g. 3). However, this is something we must bear in mind later. 26 4 Constructing an Object Oriented System Component Component (aPump) (aFuse) (aRelay) (aMotor) a Pump Fuse Relay Motor (aPump) (aFuse) (aRelay) (aMotor) b Fig. 7 Bringing It All Together So far we have identified the primary objects in our system and the basic set of services they should present.
Relay sends a second working? message to the fuse the fuse replies to the relay the relay replies to the motor 28 4 Constructing an Object Oriented System Wash wipe switch 2. state? 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.