Functional Programming Patterns in Scala and Clojure: Write by Michael Bevilacqua-Linn

By Michael Bevilacqua-Linn

Remedy real-life programming issues of a fragment of the code that natural object-oriented programming calls for. Use Scala and Clojure to unravel in-depth issues of units of styles: object-oriented styles that turn into extra concise with sensible programming, and natively practical styles. Your code should be extra declarative, with fewer insects and reduce upkeep costs.

Functional languages have their very own styles that enable you resolve issues of much less code than object-oriented programming by myself. This publication introduces you, the skilled Java programmer, to Scala and Clojure: sensible, production-quality languages that run at the JVM and interoperate with current Java. by utilizing either the statically typed, type-inferred Scala and the dynamically typed, glossy Lisp Clojure, you'll achieve a large realizing of practical programming.

For each one development, you'll first see the conventional object-oriented answer, after which dig into the useful replacements in either Scala and Clojure. those styles are universal within the useful international and should turn into a part of your problem-solving toolkit. at the object-oriented aspect, you'll see many universal styles, reminiscent of Command, method, and Null item. at the sensible aspect, you'll research middle practical styles similar to Memoization, Lazy series, and Tail Recursion.

Each development is helping you remedy a standard programming challenge. operating via them can provide a collection of styles you should use to unravel difficulties you come back throughout whereas writing courses. ultimately, you'll paintings your current Java code into new Scala or Clojure tasks. you can begin off small, including sensible code bit by bit, so that you can supplement your present wisdom with Scala and Clojure as those languages achieve recognition at the JVM.

What You Need

Clojure 1.5 and Scala 2.10.Optionally, Eclipse with plugins.

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Foo = 1; ... } ) { ... if ( foo ) ... } no declaration of foo is needed in either f2 or or f3, because the external definition of foo appears before them. But if f1 wants to use foo, it has to contain the declaration f1( ) { extern int foo; ... } This is true also of any function that exists on another file; if it wants foo it has to use an extern declaration for it. ) CHAPTER 3 PROGRAMMING IN C: A TUTORIAL 53 There are some hidden pitfalls in external declarations and definitions if you use multiple source files.

A mod b). The results are machine dependent unless a and b are both positive. In arithmetic, char variables can usually be treated like int variables. Arithmetic on characters is quite legal, and often makes sense: c = c + 'A' - 'a'; converts a single lower case ascii character stored in c to upper case, making use of the fact that corresponding ascii letters are a fixed distance apart. The rule governing this arithmetic is that all chars are converted to int before the arithmetic is done. Beware that conversion may involve sign-extension if the leftmost bit of a character is 1, the resulting integer might be negative.

Remember that by convention all character arrays are terminated with a `\0'. = '\0'; s++ ) n++; return(n); } You can now see why we have to say what kind of thing s points to -- if we're to increment it with s++ we have to increment it by the right amount. = '\0'; n++ ); The `*s' returns a character; the `++' increments the pointer so we'll get the next character next time around. As you can see, as we make things more efficient, we also make them less clear. But `*s++' is an idiom so common that you have to know it.

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