Style tiles provide a balance between the abstract nature of a mood board and the completeness of a wireframe — helping teams make design decisions faster.
Changing the borderColor & shadowColor of a UIView and the font properties of a UISegmentedControl in XCode w/user-defined runtime attributes & Objective-C.
Ember.js has a very powerful computed property, and surprisingly good support for array mutation observers. The array.[] syntax can help you on your way.