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

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By John Hunt

Scala is a brand new programming language constructed 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 ways with useful programming. even though a few familiarity with typical computing innovations is believed (such because the suggestion of compiling a software and executing this compiled shape, etc.) and with uncomplicated procedural language techniques (such as variables and allocation of values to variables) the early chapters of the ebook don't think any familiarity with item orientation nor sensible programming. those chapters additionally step via different suggestions with which the reader will not be frequent (such as checklist processing). From this history, John Hunt offers a pragmatic advent to item and useful know-how utilizing Scala, one of many most modern and finest programming languages on hand. various innovations are brought via sensible 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 interested in the software program will locate this finished creation to Scala and to item orientation and sensible programming, invaluable.

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Extra resources for A Beginner's Guide to Scala, Object Orientation and Functional Programming

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To summarise then: Imperative Programming is what is currently perceived as traditional programming. That is, it is the style of programming used in languages such as C, C++, Java and C# etc. g. x = y + z etc. It is thus oriented around control statements, looping constructs and assignments. Functional Programming aims to describe the solution, that is what the program needs to be do (rather than how it should be done). 3 Advantages to Functional Programming There are a number of significant advantages to functional programming compared to imperative programming.

The Object Oriented paradigm has been such a success because it can be used to model concepts and entities within problem domains. When this is combined with the ability to treat functions as first class entities we obtain a very powerful Environment. For example, we can now create classes that will hold data (including other objects) and define behaviours in terms of methods but which can easily and naturally be given functions that can be applied to the members of that object. val numbers = List(1, 2, 3, 4, 5) println(numbers) In this case I have created a list of integers (note that this is a list of Integers as the type has been inferred by Scala) that are stored in the variable numbers.

Partial Evaluation. Since functions do not have side effects, it also becomes practical to bind one or more parameters to a function at compile time and to reuse these functions with bound values as new functions that take fewer parameters. 4 Disadvantages of Functional Programming If functional programming has all the advantages previously described, why isn’t it the mainstream force that imperative programming languages are? The reality is that functional programming is not without its disadvantages, including: • Input-output is harder in a purely functional language.

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