¿Qué son los PATRONES de DISEÑO?

What Are Design Patterns?

Introduction to Design Patterns

• Héctor del León introduces the topic of design patterns, emphasizing their importance in programming and encouraging viewers to learn about them.

• He notes that design patterns are often a common interview question in technical interviews, highlighting their relevance in the industry.

Definition and Purpose of Design Patterns

• Design patterns are defined as techniques for solving common problems encountered throughout programming history. They provide proven solutions that enhance code maintainability, scalability, and readability.

• A key aspect of design patterns is that they offer an abstract language that allows other programmers to understand the problem being addressed quickly.

Importance and Application of Design Patterns

• While not mandatory for all projects, using design patterns can be beneficial if they align with project objectives; however, forcing a pattern where it doesn't fit can lead to over-engineering.

• The concept of design patterns gained traction with the publication of "Design Patterns: Elements of Reusable Object-Oriented Software" by the "Gang of Four" in 1994.

Types of Design Patterns

Categories of Design Patterns

• The book categorizes design patterns into three main types: creational, structural, and behavioral.

Creational Patterns

• An example is the Builder pattern which addresses issues related to object construction when there are many parameters involved. It allows for more flexible object creation through method chaining.

Behavioral Patterns

• The Observer pattern is discussed as a way for objects (like chat applications) to notify others about changes in state. This is crucial for reactive programming frameworks like Angular or React.

Practical Examples

Real-world Applications

Control Functionality in Video Games

Overview of Control Functions

• The control will have specific functions such as buttons for kicks, covering, and jumping. It is the same control used across different games like FIFA and King of Fighters.

• Each game utilizes the same control but has distinct functionalities; for instance, fighting games allow combos and special moves through button sequences, while sports games enable faster running with specific button presses.

Design Pattern: Bridge

• A design pattern called "bridge" can be applied here to create an interface that includes actions like moving up/down or pausing the game.

• This bridge structure allows different video games (e.g., King of Fighters and Crash Bandicoot) to function with the same control setup without altering their core mechanics.

Interface Concept in Programming

• The bridge method establishes a system where each game has events tied to specific buttons (like triangle or X), which may differ between games but relate back to the control's functionality.

• Understanding interfaces is crucial; they act as contracts that define required properties and methods that must be implemented by any class using them.

Implementation of Interfaces

• When a game implements an interface, it must provide actions for all specified controls (triangle, X, square, circle), ensuring compliance with the defined contract.

• The controller recognizes this interface during its construction process, allowing it to focus solely on user input rather than how each game's logic operates.

Complexity of Design Patterns

• There is a misconception that design patterns are inherently complex; however, complexity varies based on familiarity with class diagrams and object-oriented programming principles.

• Learning design patterns can be simplified through resources available online; understanding these concepts does not require extensive coding knowledge initially.

Conclusion & Resources

• The speaker encourages viewers to explore design patterns further through accessible courses offered in their channel's comments section.