Download Becoming Functional by Joshua Backfield PDF

By Joshua Backfield

If you have got an crucial (and most likely object-oriented) programming historical past, this hands-on booklet will advisor you thru the alien international of practical programming. writer Joshua Backfield starts off slowly through displaying you the way to use the main invaluable implementation thoughts ahead of taking you additional into functional-style thoughts and practices.

In each one bankruptcy, you’ll research a sensible notion after which use it to refactor the fictitious XXY company’s imperative-style legacy code, writing and checking out the useful code your self. As you move throughout the ebook, you’ll migrate from Java 7 to Groovy and at last to Scala because the want for larger sensible language aid progressively increases.

examine why today’s finely tuned purposes paintings greater with sensible code
rework imperative-style styles into sensible code, following easy steps
wake up to hurry with Groovy and Scala via examples
know the way firstclass features are handed and lower back from different functions
Convert present tools into natural features, and loops into recursive methods
swap mutable variables into immutable variables
Get hands-on event with statements and nonstrict evaluations
Use useful programming along object-oriented design

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Becoming Functional

If you might have an primary (and most likely object-oriented) programming historical past, this hands-on publication will advisor you thru the alien global of practical programming. writer Joshua Backfield starts slowly via exhibiting you the way to use the main worthy implementation strategies prior to taking you additional into functional-style innovations and practices.

In each one bankruptcy, you’ll research a sensible notion after which use it to refactor the fictitious XXY company’s imperative-style legacy code, writing and checking out the sensible code your self. As you move throughout the publication, you’ll migrate from Java 7 to Groovy and eventually to Scala because the want for higher practical language help steadily increases.

research why today’s finely tuned functions paintings greater with useful code
rework imperative-style styles into sensible code, following simple steps
wake up to hurry with Groovy and Scala via examples
know the way firstclass features are handed and lower back from different services
Convert present tools into natural features, and loops into recursive equipment
switch mutable variables into immutable variables
Get hands-on adventure with statements and nonstrict reviews
Use useful programming along object-oriented design

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Additional resources for Becoming Functional

Example text

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.

For example, we might just want to create a list of all the enabled contacts. Your boss has asked you to add functionality to change a Contact’s name and email, because people get married or have other life events requiring name changes. Now let’s assume that our application is actually threaded (maybe it’s a web server). If you don’t see an issue, you’re about to. You just sat down to work, happy that you got the “change name and email” functionality done and rolled out. ” The support team includes the broken email in the bug as well.

We can then use the return to print out each Contract that was updated. Example 3-20. setEnabled(status); } } ); } We’re now at the point where we need to abstract our foreach, map, and filter functions so that we’re not just bound to our Customer object. java, as shown in Example 3-21. Don’t forget to update the references to these methods. Example 3-21. add(obj); } } return outList; } } Now we just need to print the Contracts that changed, as shown in Example 3-22. Notice that we are implementing setContractForCustomer followed by a foreach on our returned list.

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