Download Functional Thinking: Paradigm Over Syntax by Neal Ford PDF

By Neal Ford

So that you can reap the benefits of useful programming positive aspects 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 means. software program architect Neal Ford exhibits intermediate to complex builders how practical coding lets you step again a degree of abstraction so that you can see your programming challenge with better readability. each one bankruptcy indicates you a variety of examples of useful pondering, utilizing various code examples from Java eight and different JVM languages that come with practical services. This publication may possibly bend your brain, yet you will come away with a superb take hold of of sensible programming innovations.

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Either fold or reduce is commonly used when you need to process a collection of items to produce a different-sized (usually smaller but not necessarily) value, which could be a collection or a single value. Use reduce or fold for piecewise collection processing. Number classification is of course a contrived example, so it’s hard to generalize to different types of problems. However, I’ve noticed a significant change in coding style on projects using languages that support these abstractions (whether they are functional languages or not).

You can define anonymous functions more concisely without using case, but the case syntax provides the additional benefits that Example 3-13 illustrates. Example 3-13. Differences between map and collect List(1, 3, 5, "seven") map { case i: Int ? String) List(1, 3, 5, "seven") collect { case i: Int ? i + 1 } // verify assert(List(2, 4, 6) == (List(1, 3, 5, "seven") collect { case i: Int ? i + 1 })) In Example 3-13, I can’t use map on a heterogeneous collection with case: I receive a MatchError as the function tries to increment the "seven" string.

Curry(quadrate, octate) println "composition of curried functions yields ${thirtyTwoer(2)}" In Example 3-8, I create a composite code block that composes two functions, or calls one function on the return of the other. Using that code block, I create a thirtyTwoer code block, using partial application to compose the two methods together. info In Clojure Clojure includes the (partial f a1 a2 …) function, which takes a function f and a fewer-than-required number of arguments and returns a partially applied function that’s invokable when you supply the remaining arguments.

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