Download Becoming Functional: Steps for Transforming Into a by Joshua Backfield PDF

By Joshua Backfield

When you've got an primary (and most likely object-oriented) programming history, this hands-on ebook will advisor you thru the alien global of useful programming. writer Joshua Backfield starts off slowly through displaying you ways to use the main necessary implementation strategies sooner than taking you extra into functional-style thoughts and practices. In every one bankruptcy, you will examine a useful notion after which use it to refactor the fictitious XXY company's imperative-style legacy code, writing and checking out the practical code your self. As you move throughout the e-book, you are going to migrate from Java 7 to Groovy and eventually to Scala because the want for higher practical language aid steadily raises.

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Extra resources for Becoming Functional: Steps for Transforming Into a Functional Programmer

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As I said earlier, you can’t entirely avoid side effects in your code. This being the case, we just need to wrap the side effect so that the output is always dependent on the input. info Conclusion So far, we’ve discussed how to use higher-order functions to create more abstract func‐ tionality. I’ve also shown you how to take functions and make them pure, such that the entirety of the output is reliant on the parameter list. It takes time and practice to really get the hang of refactoring into a functional style.

We then use the collect method to convert one object into another, as we did with our Function1 passed into the getField. Example 2-19. info Groovy Syntax There are a couple of things to note about our code in Example 2-19. • There is no need for the keyword return. Groovy uses the last statement in a function as the return of that function. • An anonymous function is composed of curly braces, {}, with an arrow, ->. To the left of the arrow is the parameter list, and to the right is the body of the function.

Example 4-5. sendEmail, which takes a string, performs a replace for member variables, and then sends out the email. Let’s get even more func‐ tional—we might need to do something else later for each enabled Contact. So, let’s use a closure, as shown in Example 4-6. Example 4-6. sendE mail(msg) }) and get our functionality. At this point, we have a nice set of functionality that we can call anytime we need to do something for all enabled contacts. For example, we might just want to create a list of all the enabled contacts.

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