Chapter 4. Modules and program organization
In this chapter
- Encapsulation of behavior in modules
- Modular extension of classes
- The object method-lookup path
- Handling method-lookup failure
- Establishing namespaces with modules and nesting
This chapter will introduce you to a Ruby construct that’s closely related to classes: modules. Like classes, modules are bundles of methods and constants. Unlike classes, modules don’t have instances; instead, you specify that you want the functionality of a particular module to be added to the functionality of a class or of a specific object.
The greatest strength of modules is that they help with program design and flexibility. You’ll see evidence of this both in examples of modules you can write
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