Download Becoming Functional by Joshua Backfield PDF

By Joshua Backfield

If you've gotten an crucial (and most likely object-oriented) programming heritage, this hands-on ebook will advisor you thru the alien international of sensible programming. writer Joshua Backfield starts off slowly by means of displaying you ways to use the main worthwhile implementation options sooner than taking you extra into functional-style suggestions and practices.

In each one bankruptcy, you’ll research a useful suggestion after which use it to refactor the fictitious XXY company’s imperative-style legacy code, writing and trying out the useful code your self. As you move during the e-book, you’ll migrate from Java 7 to Groovy and at last to Scala because the want for higher useful language help steadily increases.

examine why today’s finely tuned functions paintings larger with useful code
remodel imperative-style styles into useful code, following easy steps
wake up to hurry with Groovy and Scala via examples
know how first class capabilities are handed and back from different functions
Convert current tools into natural services, and loops into recursive methods
switch mutable variables into immutable variables
Get hands-on event with statements and nonstrict evaluations
Use sensible programming along object-oriented design

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Sample text

Str has changed over time? We’ll need to debug to find out that func is indeed changing our variable. ” Immutability gives us the confidence that our variables will not be changing and that our objects will be the same no matter to which function we send them. Let’s head back over to XXY. Your boss has come back with another request, this time a little more sane. He needs to send emails to the customers if the following conditions are met: • The Customer is enabled. • The Contract is enabled. • The Contract has not expired.

Our function f is a formal definition, but what if we want to pass in a function as the parameter c for something really simple, such as a square of the input? Let’s see that and substitute our variables: f (10, y → y 2) = 102 / ( y → y 2)(10) The lambda expression is a function that takes an x parameter and performs the x2 operation. So when we substitute, we can actually replace the entire c(x) definition with the lambda function itself. ” However, he’s concerned with the number of extra classes being created and feels they are unnecessary.

After that, we refactored the inner workings of our copy-and-paste code into simple, anonymous functions and even used a closure in case our boss ever wants to extend the functionality of the prepending email addresses. The more we converted our copy-and-paste code using these functional concepts, the simpler our code became. It also became much easier for us to add new functionality Conclusion | 23 because we no longer had to copy and paste things like our for loops or other pieces that we extracted into our higher-order function getField.

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