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Evergreen Valley College, Oct. 3rd, 2015
Clean Code I
Best Practices
Theo Jungeblut
• Director Customer Success at
AppDynamics in San Francisco
• Coder & software craftsman by night,
first time dad and house builder
• Architects decoupled solutions
& crafts maintainable code to last
• Worked in healthcare and factory
automation, building mission critical
applications, framework & platforms
• Degree in Software Engineering
and Network Communications
• Enjoys cycling, running and eating
theo@designitright.net
www.designitright.net
We are hiring!
http://www.appdynamics.com/ careers
Your feedback is important!
http://speakerrate.com/speakers/18667-theo-jungeblut
Where to get the Slides
http://www.slideshare.net/theojungeblut
Overview
• Why Clean Code
• Clean Code Developer Initiative
• Principles and Practices
• Code Comparison
• Q&A
Does writing Clean Code
make us more efficient?
The only valid Measurement of Code
Quality
What is Clean Code?
Clean Code is maintainable
Source code must be:
• readable & well structured
• extensible
• testable
Software
Engineering
&
Software
Craftsmanship
The “Must Read”-Book(s)
by Robert C Martin
A Handbook of Agile
Software Craftsmanship
“Even bad code can
function. But if code isn’t
clean, it can bring a
development organization
to its knees.”
Code Maintainability *
Principles Patterns Containers
Why? How? What?
Extensibility Clean Code Tool reuse
* from: Mark Seemann’s “Dependency Injection in .NET” presentation Bay.NET 05/2011
Clean Code Developer
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
The 4 values of the CCD initiative
• Correctness
• Evolvability
• Production Efficiency
• Continuous Improvement
http://blogs.telerik.com/justteam/posts/13-05-16/clean-code-developer-school
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 1st Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Keep it simple, stupid
(KISS)
KISS-Principle – “Keep It Simple Stupid”
http://blogs.smarter.com/blogs/Lego%20Brick.jpg
by Kelly Johnson
The Power of Simplicity
http://www.geekalerts.com/lego-iphone/
Graphic by Nathan Sawaya courtesy of brickartist.com
Graphic by Nathan Sawaya courtesy of brickartist.com
Chaos build from simplicity
Graphic by Nathan Sawaya courtesy of brickartist.com
Don’t
repeat yourself
(DRY)
Don’t repeat yourself (DRY)
by Andy Hunt and Dave Thomas in their book “The Pragmatic Programmer”
// Code Copy and Paste Method
public Class Person
{
public string FirstName { get; set;}
public string LastName { get; set;}
public Person(Person person)
{
this.FirstName = string.IsNullOrEmpty(person.FirstName)
? string.Empty : string.Copy(person.FirstName);
this.LastName = string.IsNullOrEmpty(person.LastName)
? string.Empty : string.Copy(person.LastName);
}
public object Clone()
{
return new Person(this);
}
}
// DRY Method
public Class Person
{
public string FirstName { get; set;}
public string LastName { get; set;}
public Person(Person person)
{
this.FirstName = person.FirstName.CloneSecured();
this.LastName = person.LastName.CloneSecured();
}
public object Clone()
{
return new Person(this);
}
}
public static class StringExtension
{
public static string CloneSecured(this string original)
{
return string.IsNullOrEmpty(original) ? string.Empty : string.Copy(original);
}
}
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 1st Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Clean Code Developer – 2nd Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Separation of Concerns
(SoC)
Single Responsibility
Principle
(SRP)
http://www.technicopedia.com/8865.html
The Product
http://www.technicopedia.com/8865.html
Component / Service
http://technicbricks.blogspot.com/2009/06/tbs-techpoll-12-results-2009-1st.html
Class, Struct, Enum etc.
Separation of Concerns (SoC)
• “In computer science, separation
of concerns (SoC) is the process of
separating a computer program into
distinct features that overlap in
functionality as little as possible.
•A concern is any piece of interest or
focus in a program. Typically,
concerns are synonymous with
features or behaviors. “
probably by Edsger W. Dijkstra in 1974
http://en.wikipedia.org/wiki/Separation_of_Concerns
Single Responsibility Principle (SRP)
“Every object should have a single responsibility, and that
responsibility should be entirely encapsulated by the class.”
by Robert C Martin
http://www.ericalbrecht.com
http://en.wikipedia.org/wiki/Single_responsibility_principle
public class Logger : ILogger
{
public Logger(ILoggingSink loggingSink)
{}
public void Log(string message)
{}
}
Read, Read, Read
Clean Code Developer – 2nd Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 3rd Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Information Hiding
Principle
(IHP)
“.. information hiding is the principle of
segregation of the design decisions on a
computer program that are most likely to
change, ..”
Information Hiding Principle (IHP)
by David Parnas (1972)
http://en.wikipedia.org/wiki/Information_hiding
Interfaces / Contracts
public interface ILogger
{
void Log(string message);
}
• Decouple Usage and Implementation through introduction of a contract
• Allows to replace implementation without changing the consumer
public class Logger : ILogger
{
public Logger(ILoggingSink loggingSink)
{}
public void Log(string message)
{}
}
Liskov Substitution
Principle
(LSP)
“Liskov’s notion of a behavioral subtype
defines a notion of substitutability for
mutable objects”
Liskov Substitution Principle (LSP)
by Barbara Liskov, Jannette Wing (1994)
http://en.wikipedia.org/wiki/Liskov_substitution_principle
http://www.objectmentor.com/resources/articles/lsp.pdf
Dependency Inversion
Principle
(DIP)
Dependency Inversion Principle (DIP)
• “High-level modules should not depend on low-level
modules. Both should depend on abstractions.
• Abstractions should not depend upon details. Details
should depend upon abstractions.”
http://en.wikipedia.org/wiki/Dependency_inversion_principle
http://www.objectmentor.com/resources/articles/dip.pdf
by Robert C. Martin
Next Silicon Valley Code Camp Oct. 2016
https://www.siliconvalley-codecamp.com
Mini Conferences – User Groups 
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 3rd Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 4th Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Open Closed Principle
(OCP)
An implementation is open for extension
but closed for modification
Open/Closed Principle (OCP)
by Bertrand Meyer (1988)
http://en.wikipedia.org/wiki/Open/closed_principle
Law of Demeter
(LoD)
“
• Each unit should have only limited knowledge about
other units: only units “closely” related to the
current unit.
• Each unit should only talk to its friends;
don’t talk to strangers
• Only talk to your immediate friends.”
Law of Demeter (LoD)
Northeastern University (1987)
http://en.wikipedia.org/wiki/Law_Of_Demeter
Single Responsibility Principle
Open/Closed Principle
Liskov Substitution Principle
Interface Segregation Principle
Dependency Inversion Principle
S
O
L
I
D
Robert C Martin: http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 4th Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Clean Code Developer – 5th Iteration
by Ralf Westphal & Stefan Lieser – http://www.clean-code-developer.de
Clean Code Developer
Graphic by Michael Hönnig http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
Summary Clean Code
Maintainability is achieved through:
• Readability (Coding Guidelines)
• Simplification and Specialization
(KISS, SoC, SRP, OCP, )
• Decoupling (LSP, DIP, IHP, Contracts,
LoD, CoP, IoC or SOA)
• Avoiding Code Bloat (DRY, YAGNI)
• Quality through Testability
(all of them!)
Downloads,
Feedback & Comments:
Q & A
Graphic by Nathan Sawaya courtesy of brickartist.com
theo@designitright.net
www.designitright.net
http://speakerrate.com/ speakers
/18667-theo-jungeblut
Time to say Thank You!
The Organizers
Evergreen Valley College (team)
The volunteers (how about you?)
TheSponsors
Picturesfromhttp://blog.siliconvalley-codecamp.com
References…http://clean-code-developer.com
http://blogs.telerik.com/justteam/posts/13-05-16/clean-code-developer-school
http://michael.hoennig.de/2009/08/08/clean-code-developer-ccd/
http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
http://www.manning.com/seemann/
http://en.wikipedia.org/wiki/Keep_it_simple_stupid
http://picocontainer.org/patterns.html
http://en.wikipedia.org/wiki/Separation_of_concerns
http://en.wikipedia.org/wiki/Single_responsibility_principle
http://en.wikipedia.org/wiki/Information_hiding
http://en.wikipedia.org/wiki/Liskov_substitution_principle
http://en.wikipedia.org/wiki/Dependency_inversion_principle
http://stackoverflow.com/questions/6766056/dip-vs-di-vs-ioc
http://en.wikipedia.org/wiki/Open/closed_principle
http://en.wikipedia.org/wiki/Law_Of_Demeter
http://en.wikipedia.org/wiki/Don't_repeat_yourself
http://en.wikipedia.org/wiki/You_ain't_gonna_need_it
http://en.wikipedia.org/wiki/Component-oriented_programming
http://en.wikipedia.org/wiki/Service-oriented_architecture
http://www.martinfowler.com/articles/injection.html
http://www.codeproject.com/KB/aspnet/IOCDI.aspx
http://msdn.microsoft.com/en-us/magazine/cc163739.aspx
http://msdn.microsoft.com/en-us/library/ff650320.aspx
http://msdn.microsoft.com/en-us/library/aa973811.aspx
http://msdn.microsoft.com/en-us/library/ff647976.aspx
http://msdn.microsoft.com/en-us/library/cc707845.aspx
http://unity.codeplex.com/
http://www.idesign.net/idesign/DesktopDefault.aspx?tabindex=5&tabid=11
… more References
Resharper
http://www.jetbrains.com/resharper/
FxCop / Code Analysis
http://msdn.microsoft.com/en-us/library/bb429476(VS.80).aspx
http://blogs.msdn.com/b/codeanalysis/
http://www.binarycoder.net/fxcop/index.html
Code Contracts
http://msdn.microsoft.com/en-us/devlabs/dd491992
http://research.microsoft.com/en-us/projects/contracts/
StyleCop
http://stylecop.codeplex.com/
Ghostdoc
http://submain.com/products/ghostdoc.aspx
Spellchecker
http://visualstudiogallery.msdn.microsoft.com/
7c8341f1-ebac-40c8-92c2-476db8d523ce// Lego (trademarked in capitals as LEGO)
Blog, Rating, Slides
http://www.DesignItRight.net
http://speakerrate.com/speake
rs/18667-theo-jungeblut
www.slideshare.net/theojungeblut
… thanks for you attention!
And visit and support the
www.siliconvalley-codecamp.com
Please fill out the
feedback, and…
www.speakerrate.com/theoj

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Clean Code I - Best Practices

Editor's Notes

  1. A object or any type implementing subtype or a certain interface can be replaced with another object implementing the same base type or interface.