Strategy and Factory patterns in Typescript

I've recently read the dzone article Design Patterns: The Strategy and Factory Patterns which gives clean example of how design patterns such as Strategy and Factory patterns can improve code structure in every day programming tasks.
I've converted the JAVA syntax used in the article to Typescript, to see how close are the language constructs in those two. Here's the gist with the code:

Android app development quick start

I've been diving into native Android application development with Android Studio lately. It went quite well, thanks to lots of available tutorials and large community on Stackoverflow.

As a result of last 2 weeks I've created this gist with links and code snippets for Android development that will hopefully help you to bootstrap. 

Full gist is inside of the post.