FAQ Pattern design

1. What is Pattern design?

Pattern designs are solutions that are given as a whole after being optimized and reused. This is often applied to design software that we encounter every day. Many people consider them as sets of solutions after being thought about and solved in a very specific situation.

Why is Design Patterns so important?

Using the Pattern Design, programmers can easily reuse and apply it to solve issues with similar problems. Some of the problems that developers have faced, they can come up with solutions and solve it by themself. However, that is not the most optimal and appreciated method in the long term. Pattern Design is the best to use when you are in need of quality solutions for common problems.

Thanks to the Design Pattern, the developer can be able to approach and take advantage of most of the current programming languages for their job. Using this solution helps solve problems more quickly and efficiently, thereby providing object-oriented programming (OOP) solutions.

2. What makes the best pattern design?

In order to understand and make good use of pattern design, you need to have the fundamentals of programming languages ​​and some experience in the industry. Also, to create the best pattern design, programmers need to have basic knowledge and experience in these below fields:

• 4 characteristics of OOP: Design Pattern uses the foundation of object-oriented programming, so it must apply: Inheritance, Polymorphism, Abstraction, and Closure.
• The two concepts of interface and abstraction: In order to thoroughly understand and apply them in the job.
• OOP-solutions-oriented thinking: Therefore, leaving the ordinary structural thinking behind.

3. The three main types of pattern design

The system of design patterns is divided into 3 groups: The Creational group (5 patterns), the Structural group (7 patterns), and the Behavioral group (11 patterns).

Creational Patterns

Design patterns of this kind provide a solution for creating objects. This makes the program more flexible in deciding which objects should be created in the given situations. This type of pattern design includes:

• Abstract Factory
• Builder
• Factory
• Prototype
• Singleton

Structural Patterns

Design patterns of this type are related to classes and object members. It is used to establish and define relationships between objects. This type of pattern design includes:

• Adapter
• Bridge
• Composite
• Decorator
• Facade
• Flyweight
• Proxy

Behavioral Patterns

This group is used to implement the behavior of the object, and the communication between them. This type of pattern design includes:

• Chain of responsibility
• Command
• Interpreter
• Iterator
• Mediator
• Memento
• Observer
• State
• Strategy
• Template method
• Visitor

*If you are the buyer, you will need to learn about this field in order to make better decisions later on.

4. How many new pattern design books are there today?

For a more thorough understanding in this field of those who are buyers, here are two basic books for you to learn about what can pattern designers be applied in the projects:

Design Patterns For Dummies: This is a book by author Steven Holzner. Right from the title of the book, we can consider it as a book for beginners, and even Dummies can understand and use it. They apply a lot of easy-to-understand knowledge and are chosen by many people as textbooks for their reference.

Head First: This book is widely considered to be very easy for beginners to understand, and the language is also common and easy to apply.

5. What are the reasons coders should use design patterns?

• Speeding ​​up software development: During application development, the use of design patterns will provide programmers tools to solve problems related to software design. This will speed up software development more.
• Reusing efficient codes: Design patterns also help developers to avoid causing bugs and solve them. Along with that, the project will be upgraded and better maintained in the future.
• Clear code, more effective teamwork: For example, just name a design pattern, and everyone can easily visualize the structure, and the idea behind it and make use of it. Pattern designs contribute to optimizing the development time of ideas because it limits the time of interpretation. Thereby, the teamwork process will be more effective.

6. When to use Design Patterns

• Creating direct objects with a clear mission: a system that is too tightly tied to a specific setting will not have the flexibility and make it difficult to scale.

=> Solution: Create objects indirectly using Abstract Factory, Factory Method, and Prototype.

• Depending on specific tasks: the system has only one way to respond to requests.

=> Solution: The developer avoids writing fixed code by using the Chain of Responsibility, Command.

• Depending on the hardware or software platform: the application is difficult to port to other platforms.

=> Solution: limiting the platform dependency by using Abstract Factory and Bridge.

• Depending on the user interface or client code: the user interface and client code can be changed if the objects in the system change.

=> Solution: isolated from Client, using Abstract Factory, Bridge, Memento, Proxy.

• Depending on the algorithm: the algorithm used changes frequently. When the algorithm changes, the objects that depend on it are forced to change.

=> Solution: isolated algorithm, use Builder, Iterator, Strategy, Template Method, Visitor.

• Constraints are too tight: classes that are too tightly bound together will be difficult to reuse, test, and maintain.

=> Solution: The developers weaken the too-tight association between classes by using Abstract Factory, Bridge, Chain of Responsibility, Command, Facade, Mediator, and Observer.

• Extending class functionality by inheritance: inheritance is harder to use and harder to understand than composition.

=> Solution: extending the function to avoid inheritance and use synthesis, with Bridge, Chain of Responsibility, Composite, Decorator, Observer, and Strategy.

• Customizing classes: classes are inaccessible, incomprehensible, or difficult to change.

=> Solution: do not interfere with the class but extend it by using an Adapter, Decorator, and Visitor.

7. Why are Design Patterns difficult for a newbie?

Architecture and Design Patterns have high abstraction, so it is quite difficult to understand for newcomers. The lack of experience with the problems that architecture and design patterns focus on is very ambiguous. So if you are in need of developing a project but the skills are not enough, you can refer to some of the above theories and find yourself freelancers who have the background and experience to support.

8. Where to hire a freelance pattern designer?

Design Pattern represents the experience of programming, building, and designing software. Those who understand and apply the appropriate Design Pattern in the system will save a lot of time and effort, and it's easier to develop, extend and maintain.

You can look anywhere in your place of residence or relationship, but this no longer seems convenient with the progress of your work. Right now you can find a freelance pattern designer at papmall® with intelligent payment methods and a chance to feedback and fix.