Book Image

Learning Play! Framework 2

By : Andy Petrella
Book Image

Learning Play! Framework 2

By: Andy Petrella

Overview of this book

<p>The Learning Play! Framework 2 has been created for web developers that are building web applications. The core idea is to focus on the HTTP features and to enable them through a simplification lens. Building a web application no longer requires a configuration phase, an environment setup, or a long development lifecycle - it's integrated!<br /><br />Learning Play! Framework 2 will enable any web developers to create amazing web applications taking advantage of the coolest features. It's the fastest way to dive into Play!, focusing on the capabilities by using them in a sample application. Although essentially Java based code, a Scala version is presented as well – giving an opportunity to see some Scala in action.<br /><br />After setting up the machine and learning some Scala, you will construct an application which builds from static to dynamic, before introducing a database. <br /><br />Then we'll focus on how data can be consumed and rendered in several ways. This will enable some real time communication through WebSocket and Server-Sent Event – on both server and client sides.</p> <p>The book will end with testing and deployment, which completes any web development project.</p>
Table of Contents (20 chapters)
Learning Play! Framework 2
Credits
About the Author
Acknowledgement
About the Reviewers
www.packtpub.com
Preface
Materials
Index

Partial application


In simple terms, a function in Scala can declare several blocks of parameters. Thus, a partial application of a function in Scala either leaves at least one block without values or one parameter without a block. In this section, we'll only talk about the first case.

Actually, filling up the last parameter block will create another function that takes a number of block parameters and decreases them by one. Repeating this until no blocks remain will result in the whole function being applied.

As this Scala feature will extensively be used when creating a layout of our future templates, it's important to grasp this concept. Hopefully, it isn't hard; seriously!

Let's see an example of such a partially applied function:

First of all, we defined a map of i18n messages where a map is conceptually the same as java.util.Map, that is, a key-value pair type.

Then we defined a function (showMessage) that is able to retrieve an internationalized message based on its key. We can see that...