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Edward Falzon

Programming of any kind, including in game-development, can get complicated as the size and scope of a project increase. Investigating bugs and expanding the code with new functionality can be almost impossible if the code-structure is not well-thought-out.

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Programming of any kind, including in game-development, can get complicated as the size and scope of a project increase. Investigating bugs and expanding the code with new functionality can be almost impossible if the code-structure is not well-thought-out.

In this one-hour, project-based course, we will cover the third principle of "SOLID" programming: Liskov's Substitution Principle ("LSP") states that in methods that refer to a superclass (or base class), any subclass that inherits from the superclass should be useable without error. A common example of this is that if a block of code expects a Mammal class type, then we should be able to send in a Dog or Whale class type and not produce any unexpected behaviour. In the project, we will create some "typical" code that is fairly common in game-development, and then restructure it to become compliant with LSP.

This project is part three of a five-part series on SOLID Programming principles, which are:

- Single Responsibility

- Open-Closed

- Liskov's Substitution (this guided project)

- Interface Segregation

- Dependency Inversion

Each of these guided projects stands on its own, but for a full understanding of good coding practices, completing all five guided projects (in order) is recommended.

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What's inside

Syllabus

Project Overview
In this one-hour, project-based course, we will cover the third principle of "SOLID" programming: Liskov's Substitution Principle ("LSP") states that in methods that refer to a superclass (or base class), any subclass that inherits from the superclass should be useable without error. A common example of this is that if a block of code expects a Mammal class type, then we should be able to send in a Dog or Whale class type and not produce any unexpected behaviour. In the project, we will create some "typical" code that is fairly common in game-development, and then restructure it to become compliant with LSP.

Good to know

Know what's good
, what to watch for
, and possible dealbreakers
Applies the Liskov's Substitution Principle, a core principle applied in most programming domains
Provides a practical example by restructuring code used in game development to adhere to LSP
Covers the third principle in a series on SOLID programming principles, suitable for learners interested in building a strong foundation in software design

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in SOLID Programming: Liskov's Substitution Principle in Unity with these activities:
Review OOP in Java
Reviewing OOP concepts will help you better understand the 'LSP' principle.
Browse courses on OOP Concepts
Show steps
  • Review the basics of OOP, such as classes, objects, and inheritance.
  • Practice writing simple Java programs that use OOP concepts.
Follow a tutorial on LSP
Following a tutorial will help you understand the practical aspects of LSP.
Show steps
  • Find a tutorial on LSP that is appropriate for your skill level.
  • Follow the tutorial step-by-step.
  • Try to apply the concepts you learn to your own code.
Discuss LSP with a peer
Discussing LSP with a peer will help you better understand the concept and identify areas where you need more practice.
Show steps
  • Find a peer who is also studying LSP.
  • Schedule a time to meet with your peer.
  • Discuss the concept of LSP.
  • Share examples of how LSP can be applied in code.
  • Identify areas where you need more practice with LSP.
Five other activities
Expand to see all activities and additional details
Show all eight activities
Solve LSP coding problems
Solving LSP coding problems will help you improve your problem-solving skills and apply LSP in practical scenarios.
Show steps
  • Find a set of LSP coding problems.
  • Attempt to solve the problems on your own.
  • Check your solutions against the provided answers.
  • Review the solutions and identify areas where you can improve.
Write a blog post about LSP
Writing a blog post will help you solidify your understanding of LSP and improve your communication skills.
Show steps
  • Choose a topic for your blog post.
  • Research the topic and gather information.
  • Write a draft of your blog post.
  • Edit and revise your blog post.
  • Publish your blog post.
Create a simple game that uses LSP
Creating a game that uses LSP will help you apply the concept in a real-world scenario.
Show steps
  • Design the game and identify the classes and objects that will be used.
  • Implement the game using LSP.
  • Test the game to ensure that it works correctly.
Mentor a peer on LSP
Mentoring a peer on LSP will help you solidify your understanding of the concept and improve your communication skills.
Show steps
  • Find a peer who is struggling with LSP.
  • Offer to help them understand the concept.
  • Work with them to solve LSP coding problems.
  • Provide feedback on their work.
Contribute to an open-source project that uses LSP
Contributing to an open-source project that uses LSP will give you hands-on experience with the concept.
Show steps
  • Find an open-source project that uses LSP.
  • Identify an area where you can contribute.
  • Fork the project and make your changes.
  • Submit a pull request with your changes.

Career center

Learners who complete SOLID Programming: Liskov's Substitution Principle in Unity will develop knowledge and skills that may be useful to these careers:
C# Developer
C# developers who are interested in writing clean and maintainable code should consider taking this course on SOLID programming principles. This course will teach you how to apply LSP in your C# projects, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced C# developer, this course will help you take your coding skills to the next level.
Data Scientist
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your data science, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced data scientist, this course will help you take your coding skills to the next level.
Database Administrator
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your database administration, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced database administrator, this course will help you take your coding skills to the next level.
Web Developer
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your web development, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced web developer, this course will help you take your coding skills to the next level.
Game Developer
SOLID programming principles are essential for writing clean and maintainable code in game development, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your Unity projects, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced game developer, this course will help you take your coding skills to the next level.
Information Technology Manager
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your information technology management, which will help you design and implement systems that are easier to read, debug, and maintain. Whether you're a beginner or an experienced information technology manager, this course will help you take your coding skills to the next level.
Software Architect
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your software architecture, which will help you design systems that are easier to read, debug, and maintain. Whether you're a beginner or an experienced software architect, this course will help you take your coding skills to the next level.
Computer Programmer
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your computer programming, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced computer programmer, this course will help you take your coding skills to the next level.
Software Tester
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your software testing, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced software tester, this course will help you take your coding skills to the next level.
Chief Technology Officer
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your chief technology officer role, which will help you design and implement systems that are easier to read, debug, and maintain. Whether you're a beginner or an experienced chief technology officer, this course will help you take your coding skills to the next level.
Technical Lead
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your technical leadership, which will help you design and implement systems that are easier to read, debug, and maintain. Whether you're a beginner or an experienced technical lead, this course will help you take your coding skills to the next level.
Computer Science Professor
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your computer science teaching, which will help you prepare your students to write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced computer science professor, this course will help you take your teaching skills to the next level.
Software Analyst
SOLID programming principles are essential for writing clean and maintainable code, and Liskov's Substitution Principle is one of the most important. This course will teach you how to apply LSP in your software analysis, which will help you design and implement systems that are easier to read, debug, and maintain. Whether you're a beginner or an experienced software analyst, this course will help you take your coding skills to the next level.
Unity Developer
Liskov's Substitution Principle (LSP) is one of the most important principles of object-oriented programming, and it's essential for writing clean and maintainable code. This course will teach you how to apply LSP in your Unity projects, which will help you write code that is easier to read, debug, and maintain. Whether you're a beginner or an experienced Unity developer, this course will help you take your coding skills to the next level.
Software Engineer
The growing complexity of software has made it more important than ever for Software Engineers to implement coding best practices. For those interested in this field, SOLID Programming: Liskov's Substitution Principle in Unity provides a project-based course that can elevate coding practice through the study of Liskov's Substitution Principle. With this course, aspiring and current Software Engineers can learn how to write more robust and maintainable code.

Reading list

We've selected nine books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in SOLID Programming: Liskov's Substitution Principle in Unity.
Provides a comprehensive overview of object-oriented software construction, including principles, techniques, and best practices. It covers topics such as encapsulation, inheritance, polymorphism, and design patterns.
Classic reference on design patterns, which are reusable solutions to common software design problems. It provides a catalog of 23 design patterns, along with detailed explanations and examples.
Provides a more accessible and engaging introduction to design patterns than the classic text by Gamma et al. It uses humor, real-world examples, and interactive exercises to help readers understand and apply design patterns.
Provides a practical guide to agile software development in C#. It covers topics such as agile principles, design patterns, and best practices.
Provides a comprehensive overview of domain-driven design, which software design approach that focuses on the domain of the problem being solved.
Provides practical guidance on how to write clean and maintainable code. It covers topics such as coding conventions, design patterns, and refactoring techniques.
Provides a comprehensive overview of software testing, including techniques, tools, and best practices.
Classic collection of essays on software engineering. It covers topics such as software project management, software development methodologies, and software quality.

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