In Chapter 2, Creating an Application, we saw that we included
ext-debug.js in the
index.html folder, which has a smaller footprint compared to
ext-all-debug.js. Also, as shown in the figure under the fifth item in the Class system section, the dependencies are automatically downloaded. This is taken care of by the class loader and hence it saves us from specifying the dependencies, manually.
The new class system has introduced a class loader, which takes care of resolving the class dependencies and loads them. This becomes very handy during the development.
The class loader functionality is provided by the
Ext.Loader class and is enabled, by default, only when we use the development version (for example,