By Joshua Backfield
When you have an valuable (and most likely object-oriented) programming historical past, this hands-on e-book will consultant you thru the alien international of useful programming. writer Joshua Backfield starts off slowly by means of displaying you the way to use the main invaluable implementation techniques sooner than taking you additional into functional-style thoughts and practices. In each one bankruptcy, you will research a practical idea 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 during the booklet, you are going to migrate from Java 7 to Groovy and eventually to Scala because the desire for larger useful language help progressively raises.
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Extra info for Becoming Functional: Steps for Transforming Into a Functional Programmer
Example text
Example 3-14. enabled field. We’ll address how we might fix this when we start looking at immutable variables. info | 31 Returning an Empty List Rather Than Null In Example 3-14, notice that we’re able to pass the list that was re‐ turned by getCustomerById directly to foreach. This has the nice side effect that we don’t need to do null checking. ” Groovy Version of setContractEnabledForCustomer The following code shows a simple way to accomplish the same functionality we’ve just implemented, but in Groovy.
Info Whereas we’re trying to ensure that there are no functions that have side effects, we should no longer be using our foreach function. Instead, we’ll be using a map or collect function. Let’s write that really quickly so that we have it ready. Our map function will take a list of anything and another function that will be used to transform each individual item it is passed. The code in Example 3-19 shows the new map function, which will exist inside our Customer class. Example 3-19. call(obj)); } return outList; } Let’s remember our setContractForCustomer function; we can refactor it to return the list of Contracts that were updated, as shown in Example 3-20.
Example 2-11. ” We can create a new class that takes a customer and returns a customer, as shown in Example 2-12. Example 2-12. getEnabledCustomerField(new CustomerAsCusto mer()), which gives us a list of all our enabled cutomers. But what if we didn’t want to have to create all of these named classes? What if we didn’t actually need to define full classes? Well, that leads right into the next section on anonymous functions. info | 15 Anonymous Functions Anonymous functions are split into two types: lambda functions and closures.