December 2007
Intermediate to advanced
511 pages
13h 10m
English
Content preview from PHP Objects, Patterns, and Practice, Second Edition
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CHAPTER 11Performing and Representing Tasks
In this chapter, we get active. We look at patterns that help us to get things done, whether interpreting a minilanguage or encapsulating an algorithm.
This chapter will cover
- The Interpreter pattern: Building a minilanguage interpreter that can be used to create scriptable applications
- The Strategy pattern: Identifying algorithms in a system and encapsulating them into their own types
- The Observer pattern: Creating hooks for alerting disparate objects about system events
- The Visitor pattern: Applying an operation to all the nodes in a tree of objects
- The Command pattern: Creating command objects that can be saved and passed around
The Interpreter Pattern
Languages are written in other languages ...
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