YASMF v0.4 (also known as YASMF-Next) is a simple framework designed to make mobile development simpler and faster. It is short for Yet Another Simple Mobile Framework. It provides utility functions that work with: the document object model (DOM), the filesystem, and a single-inheritance object model. It also provides user interface methods that manage views and animations between them.

This version of the framework is actually a newer version of the framework we used in the previous edition of this book. It has taken the best things from that version, left a few less useful or obsolete items on the cutting-room floor, and expanded on the old version by adding useful new features. Even though it's a new version with the same name, it really is a different framework and is incompatible with prior versions of YASMF.

There are many well-established frameworks available for you to use to build a mobile app, including jQuery Mobile, Sencha Touch, Ionic, M-Project...