Download PDF by Neal Ford: Functional Thinking: Paradigm Over Syntax

By Neal Ford

In an effort to benefit from useful programming beneficial properties in Java and different languages, this in-depth consultant takes you past syntax and demonstrates the way you have to imagine in a brand new method. software program architect Neal Ford exhibits intermediate to complex builders how useful coding helps you to step again a degree of abstraction so that you can see your programming challenge with higher readability. each one bankruptcy exhibits you quite a few examples of sensible considering, utilizing a variety of code examples from Java eight and different JVM languages that come with useful services. This booklet may well bend your brain, yet you will come away with an excellent snatch of sensible programming options.

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Extra info for Functional Thinking: Paradigm Over Syntax

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Groovy makes calling a code block easy: you can either explicitly execute the call() method or use the supplied language-level syntactic sugar of placing a set of parentheses containing any parameters after the code-block name (as in octate(5), for example). info | 45 Despite the name, curry() actually implements partial application by manipulating closure blocks underneath. However, you can simulate currying by using partial appli‐ cation to reduce a function to a series of partially applied single-argument functions, as shown in Example 3-7.

And Scala has both partially applied functions and the PartialFunction class, which are distinct concepts despite the sim‐ ilar names. In Groovy Groovy implements currying through the curry() function, which originates from the Closure class. Example 3-6. call(4)}" println "8x5: ${octate(5)}" curry() fixes one parameter, returning a function that accepts a single parameter. The octate() function always multiples the passed parameter by 8. quadrate() is a function that accepts a single parameter and can be called via the call() method on the underlying Closure class.

Clojure Clojure includes a (map ) function that accepts a higher-order function (which includes operators) and a collection: (map inc numbers) ; (2 3 4 5 6 7 8 9 10 11) The first parameter for (map ) can be any function that accepts a single parameter: a named function, an anonymous function, or a preexisting function such as inc that increments its argument. The more typical anonymous syntax is illustrated in this ex‐ ample, which generates a collection of the lengths of the words in a string: (map #(count %) words) ; (3 5 5 3 6 4 3 4 3) Clojure’s (flatten ) function is similar to Groovy’s: (flatten [[1 2 3] [4 5 6] [7 8 9]]) ; (1 2 3 4 5 6 7 8 9) Fold/Reduce The third common function has the most variations in name, and many subtle differences.

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