Most design patterns are about encapsulating what varies. This video talks about how to apply that principle to iteration.
- We have many ways to store collections … of objects in data structures. … For example, most modern programming languages … provide arrays. … If you're using Java, you could store menu items … for a menu in an array like this. … Most languages provide additional structures … for storing collections of objects … like lists, dictionaries and sets. … For example, Java provides an ArrayList, … which is a lot like an array, … but has some list like capabilities too. … Here we're storing our menu items in an ArrayList. … Simple enough, but what if we need to write code … that operates over several of these collection types? … Let's say you want to write a print method … to print any menu. … To print a menu, we need to iterate over the collection … that's storing the menu items. … If you're using an array to store your menu items, … you'll write code like this. … Now if you decide to change the representation of menus … from an array to an ArrayList, … you end up rewriting all that code to print the menus …
- What are design patterns?
- Encapsulating code that varies with the Strategy pattern
- The limitations of inheritance
- Using the Adapter pattern
- Implementing the Observer pattern
- Extending behavior with composition and the Decorator pattern
- Encapsulating iteration with the Iterator pattern
- Object creation with the Factory Method pattern
- Using design principles to guide your object-oriented design
Skill Level Intermediate
1. Design Patterns
2. The Strategy Pattern
3. The Adapter Pattern
4. The Observer Pattern
Using the Observer pattern2m 23s
5. The Decorator Pattern
6. The Iterator Pattern
7. The Factory Patterns
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