Download Scala Functional Programming Patterns by Atul S. Khot PDF

By Atul S. Khot

Scala is used to build based classification hierarchies for max code reuse and extensibility and to enforce their habit utilizing higher-order capabilities. Its sensible programming (FP) positive aspects are a boon that will help you layout “easy to cause about” structures to manage the turning out to be software program complexities. understanding how and the place to use the numerous Scala suggestions is tough. Scala most sensible practices within the context of what you know is helping you snatch those options quick, and is helping you notice the place and why to exploit them.

This publication starts with the reason in the back of styles that will help you comprehend the place and why every one development is utilized. you will find what tail recursion brings on your desk and may get an knowing of ways to create options with out mutations. We then clarify the idea that of memorization and endless sequences for on-demand computation. extra, the ebook takes you thru Scala's stackable qualities and dependency injection, a favored strategy to produce loosely-coupled software program platforms.

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Java gives us the null reference to indicate a missing value. We are not supposed to call a method on it as there is no object. If, erroneously, we do, we are greeted with a Null Pointer Exception (NPE). When we design methods to return nulls, the client code that calls the method needs to check assiduously. = null) { // the dreaded null check – onus is on us... // We are on sure grounds } The problem is that the onus term is on us to check for a reference being null. Every call to makeAPoint() needs to be checked, as shown earlier.

Let's roll up our sleeves and dish out some code. isTrue(next > start); // make sure we keep moving return next; // next index to start iterating from // could be past the last valid index } This code has a lot of subtlety. We use the Apache commons 3 validation API for asserting the invariants. Download this book's source code to check out the unit test. We are using the excellent Guava library to work with lists. Note the ease of this library, with which we can create and populate the list in one line.

This is an annotation that we put on a method. We use it to make sure that the method will be compiled with tail call optimization (TCO). TCO converts the recursive form into a loop. If the Scala compiler cannot apply TCO, it flags an error. Recursion and TCO are covered in detail in Chapter 3, Recursion and Chasing Your Own Tail. Now, having set the stage—let's look at the reusability feature... Reusability – the commonality/variability analysis Instead of a fixed grouping criteria, could we make the Java version more dynamic?

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