By John Hunt
Scala is a brand new and interesting programming language that may be a hybrid among item orientated languages equivalent to Java and sensible languages similar to Haskell. As such it has its personal programming idioms and improvement styles.
Scala layout Patterns appears to be like at how code reuse might be effectively accomplished in Scala. an enormous element of this is often the reinterpretation of the unique Gang of 4 layout styles by way of Scala and its language constructions (that is using features, sessions, items and Functions). It comprises an exploration of useful layout styles and considers how those could be interpreted in Scala's uniquely hybrid style.
A key point of the e-book is the numerous code examples that accompany each one layout trend, permitting the reader to appreciate not only the layout trend but additionally to discover robust and versatile Scala language beneficial properties. together with a variety of resource code examples, this booklet could be of price to execs and practitioners operating within the box of software program engineering.
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Extra info for Scala Design Patterns: Patterns for Practical Reuse and Design
Example text
By idioms I mean essentially certain ways of doing things or using standard classes in combinations. Design patterns are an example of generic idioms, however Java has its own idioms which can be exploited. Some of these idioms have been made more formal than others and you can view the Enterprise JavaBeans as the ultimate example. They specify a very particular way of developing (and deploying) Java code that needs to be taken into account when designing a Java system (which employees Enterprise JavaBeans).
This means that we can bind one of the parameters to a value to create a new function that only takes one parameter, for example: val addTwo = (2, _: Int) This function, addTwo, now adds 2 to whatever integer is passed to it, for example: addTwo(5) will return 7. 6 A Hybrid Language If all Scala did was provide the ability to program functionally all that would do is provide yet another functional programming language. However it is the fact that Scala mixes the two paradigms that allows us to create software solutions that are both concise and expressive.
However, there are potentially very many design patterns available to a designer and number of these patterns may superficially appear to suit their requirements. Even if the design patterns are available on-line (via some hyper text style browser (Budinsky et al. 1996)) it is still necessary for the designer to search through them manually, attempting to identify the design which best matches their requirements. In addition, once they have found the design that they feel best matches their needs, they must then consider how to apply it to their application.