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\author{scottashipp}
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  /Title (object-oriented-design-principles.pdf)
  /Creator (Cheatography)
  /Author (scottashipp)
  /Subject (Object-Oriented Design Principles Cheat Sheet)
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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Object-Oriented Design Principles Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{scottashipp} via \textcolor{DarkBackground}{\uline{cheatography.com/18826/cs/1958/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}scottashipp \\
  \uline{cheatography.com/scottashipp} \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 22nd April, 2014.\\
   Updated 13th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
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  Measure your website readability!\\
  www.readability-score.com
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\begin{multicols*}{3}

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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Basic Principles}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{Encapsulate what varies.} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Code to an interface rather than to an implementation.} \tn 
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% Row 2
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\mymulticolumn{1}{x{5.377cm}}{Each class in your application should have only one reason to change.} \tn 
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% Row 3
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\mymulticolumn{1}{x{5.377cm}}{Classes are about behavior and functionality.} \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Basic OO Terms}}  \tn
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\seqsplit{Abstraction} & The process of separating ideas from specific instances of those ideas at work. \tn 
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\seqsplit{Polymorphism} & The provision of a single interface to entities of different types. Subtyping. \tn 
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% Row 2
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\seqsplit{Inheritance} & When an object or class is based on another object or class, using the same implementation; it is a mechanism for code reuse. The relationships of objects or classes through inheritance give rise to a hierarchy. \tn 
% Row Count 14 (+ 8)
% Row 3
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\seqsplit{Encapsulation} & Enclosing objects in a common interface in a way that makes them interchangeable, and guards their states from invalid changes \tn 
% Row Count 19 (+ 5)
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Favor the following over inheritance}}  \tn
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\seqsplit{Delegation} & When you hand over the responsibility for a particular task to another class or method. \tn 
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\seqsplit{Composition} & Use behavior from a family of other classes, and change that behavior at runtime. \tn 
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\seqsplit{Aggregation} & When one class is used as part of another class, but still exists outside of that other class. \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Don't Repeat Yourself (DRY)}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Avoid duplicate code by abstracting out things that are common and placing those things in a single location. \newline % Row Count 3 (+ 3)
DRY is about having each piece of information and behavior in your system in a single, sensible place.% Row Count 6 (+ 3)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Single Responsibility Principle}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{Every object in your system should have a single responsibility, and all the object's services should be focused on carrying out that single responsibility.} \tn 
% Row Count 4 (+ 4)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Open-Closed Principle}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Classes should be open for extension, and closed for modification.% Row Count 2 (+ 2)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Liskov Substitution Principle (LSP)}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Subtypes must be substitutable for their base types.% Row Count 2 (+ 2)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Interface Segregation Principle (ISP)}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Clients should not be forced to depend upon interfaces that they don't use.% Row Count 2 (+ 2)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Dependency Inversion Principle (DIP)}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{a. High level modules should not depend upon low level modules. Both should depend upon abstractions. \newline % Row Count 3 (+ 3)
b. Abstractions should not depend upon details. Details should depend upon abstractions.% Row Count 5 (+ 2)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{References}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Wood, David, Bert Bates, Kathy Sierra, Brett D. McLaughlin, Gary Pollice, and David West. Head First Object-Oriented Analysis and Design: A Brain Friendly Guide to Object Oriented Programming. Cambridge: O'Reilly Media, Incorporated, 2006. Print. \newline % Row Count 5 (+ 5)
"Abstraction (computer Science)." Wikipedia. Wikimedia Foundation, 18 Apr. 2014. Web. 25 Apr. 2014. \textless{}http://en.wikipedia.org/wiki/Abstraction\_(computer\_science)\textgreater{} \newline % Row Count 9 (+ 4)
"Polymorphism (computer Science)." Wikipedia. Wikimedia Foundation, 25 Apr. 2014. Web. 25 Apr. 2014. \textless{}http://en.wikipedia.org/wiki/Polymorphism\_(computer\_science)\textgreater{} \newline % Row Count 13 (+ 4)
"Inheritance (object-oriented Programming)." Wikipedia. Wikimedia Foundation, 21 Apr. 2014. Web. 25 Apr. 2014. \textless{}http://en.wikipedia.org/wiki/Inheritance\_(object-oriented\_programming)\textgreater{}. \newline % Row Count 17 (+ 4)
"Encapsulation (object-oriented Programming)." Wikipedia. Wikimedia Foundation, 21 Apr. 2014. Web. 25 Apr. 2014. \textless{}http://en.wikipedia.org/wiki/Encapsulation\_(object-oriented\_programming)\textgreater{}% Row Count 21 (+ 4)
} \tn 
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% That's all folks
\end{multicols*}

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