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User Interactivity – Mini Golf

by Amy M. Booker Joseph D. Walters | April 2014 | Games

This article is written by Amy M. Booker and Joseph D. Walters, the authors of Learning Objective-C by Developing iPhone Games. In this article, we are going to learn about user interaction and handling events passed from the iPhone's screen, sent from the event information to your game. This includes when a user touches, taps, or drags their finger on their screen or moves, shakes, or tilts their device. The following are the points we will touch upon in this article:

  • Using user input and touch events

  • Using gestures in iOS apps

  • Touch start, move, and end

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Using cross-validation

by Akhil Wali | April 2014 | Open Source

In this article by Akhil Wali, author of Clojure for Machine Learning, we will discuss several methods that can be used to improve the effectiveness of a given machine learning model. We will also implement a working spam classifier as an example of how to build machine learning systems that incorporate evaluation.

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Differences in style between Java and Scala code

by Thomas Alexandre | April 2014 | Open Source

In this article by Thomas Alexandre, the author of Scala for Java Developers, we discuss that if you are going to refactor or rewrite Java code into Scala code, there are a number of style differences that are useful to be aware of. Obviously, programming style is largely a matter of taste; however, a few guidelines generally acknowledged by the Scala community can help someone new to Scala to write easier-to-read and more maintainable code. This article is dedicated to showing some of the most common differences.

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The Fastest Way to Go from an Idea to a Prezi

by Hedwyg van Groenendaal | April 2014 |

In this article, by Hedwyg van Groenendaal, the author of Prezi Hotshot, we will be using the brainstorming techniques in Prezi. It is easy to create a good prezi. We will go from brainstorming to a mind map and use that as a basis for our prezi.

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Creating a real-time widget

by David Mark Clements | April 2014 | Cookbooks Open Source Web Development

In this article by David Mark Clements, author of Node Cookbook Second Edition, we will discuss how to gracefully degrade to long polling and other methods with Socket.IO.

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