Write Code For The Future You - Tulsa TechFest 2016

Tulsa TechFest 2016 | Fri, Aug 5th, 2016 | OSU - Tulsa | 70+ Speakers, 20+ Tracks & 85+ Sessions!

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Write Code For The Future You

Paul GowerPrincipal Consultant / OwnerLunamark

@paulmgower

Full Disclosure…

@paulmgower

Full Disclosure…Summer 2000

@paulmgower

Obfuscated Perl Contest

@paulmgower

Obfuscated Perl Contest

Mentality was to write “elite code” that was hard to understand

@paulmgower

Trajectory Shift

@paulmgower

Trajectory ShiftFirst job out of college, 2001

@paulmgower

Trajectory ShiftFirst job out of college, 2001Alltel Client/Server University

@paulmgower

Trajectory ShiftFirst job out of college, 2001Alltel Client/Server University

Textbook: Code CompleteDaily Lectures, Labs, and Code Reviews

@paulmgower

Real World Learning

@paulmgower

Real World Learning

Added to project towards end of development

@paulmgower

Real World Learning

Added to project towards end of developmentFixing bugs in code you didn’t write

@paulmgower

Real World Learning

Added to project towards end of developmentFixing bugs in code you didn’t writeThe Mythical Man Month by Fred Brooks

@paulmgower

Maintenance? Not me…

@paulmgower

Maintenance? Not me…

Creating Code30%

Maintaining Code70%

@paulmgower

Who reads code? Not me…

@paulmgower

Who reads code? Not me…Writing Code

Reading Code90%

@paulmgower

Why write code for the reader?

@paulmgower

Sept 1991, Comp.lang.c++ newsgroup discussion

@paulmgower

Sept 1991, Comp.lang.c++ newsgroup discussionWhy not use comma more?

@paulmgower

Sept 1991, Comp.lang.c++ newsgroup discussionWhy not use comma more?Like this:

if (condition)var = value, anothervar = anothervalue;

@paulmgower

Sept 1991, Comp.lang.c++ newsgroup discussionWhy not use comma more?Like this:

if (condition)var = value, anothervar = anothervalue;

However consider this:if (condition)var = value; anothervar = anothervalue;

@paulmgower

“Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live”

John F. Woods

@paulmgower

How To Write Better Code?

@paulmgower

How To Write Better Code?Code Complete published in 1993, 2004

@paulmgower

Agile Manifesto signed 2001

@paulmgower

Agile Manifesto signed 2001

Clean Code book published in 2009

@paulmgower

Power in Variable Names

Describe the entity it represents

@paulmgower

Easy to understand and read

@paulmgower

Easy to understand and read

Be specific as possible

@paulmgower

Variable Name Examples

Bad Namestotal, ct, checks, CHKTTLvelt, tv, traincd, current, c, datelpp, lines

Good NamesrunningTotal, checkTotaltrainVelocity, velocityInMphcurrentDate, todaysDatelinesPerPage

@paulmgower

Magic Numbers

@paulmgower

Magic Numbers == BADDon’t use magic numbers

@paulmgower

Instead use constants, enums or config

@paulmgower

Instead use constants, enums, or config

Makes code more readable / self documenting

@paulmgower

Don’t Do Thispublic void setPassword(String password){ // don't do this if (password.length() > 7) { throw newInvalidArgumentException("password"); } }

@paulmgower

public void setPassword(String password){ const int MAX_PASSWORD_SIZE = 7; if (password.length() > MAX_PASSWORD_SIZE) { throw new InvalidArgumentException("password"); }}

Use Constants or Configuration

@paulmgower

D.R.Y.

@paulmgower

D.R.Y. (Don’t Repeat Yourself)

Duplication leads to maintenance issues

@paulmgower

Y2K Culprit?

@paulmgower

Y2K Culprit?

“Every piece of knowledge must have a single, unambiguous, authoritative representation within a system”

@paulmgower

Classes: Do One Thing Well

@paulmgower

Each responsibility is an axis of change

@paulmgower

Change is going to happen

@paulmgower

Change is going to happen

Loose Coupling

@paulmgower

More than 1 Responsibility

@paulmgower

Single Responsibility

@paulmgower

Stop Writing Legacy Code

@paulmgower

Legacy Code = Code without Tests

@paulmgower

Great Step-by-step guide

@paulmgower

Great Step-by-step guide

Write unit tests as you use legacy code

@paulmgower

Code Reviews

Author + 2 Reviewers

@paulmgower

Code Reviews

Using “peer pressure”

@paulmgower

Code Reviews

Using “peer pressure”

Encourages collaboration

@paulmgower

Code Reviews Tips

Keep a positive attitude

@paulmgower

Code Reviews Tips

Keep a positive attitudeCheck your ego

@paulmgower

Code Reviews Tips

Keep a positive attitudeCheck your egoReview all code

@paulmgower

Code Reviews Tips

Keep a positive attitudeCheck your egoReview all codeCode Review early and often

@paulmgower

Final Review

@paulmgower

Final ReviewGive better variable names

@paulmgower

Final ReviewGive better variable namesDon’t use magic numbers

@paulmgower

Final ReviewGive better variable namesDon’t use magic numbersKeep your code DRY

@paulmgower

Final ReviewGive better variable namesDon’t use magic numbersKeep your code DRYClasses should do one thing

@paulmgower

Final ReviewGive better variable namesDon’t use magic numbersKeep your code DRYClasses should do one thingWrite Unit Tests

@paulmgower

Final ReviewGive better variable namesDon’t use magic numbersKeep your code DRYClasses should do one thingWrite Unit TestsHave regular Code Reviews

@paulmgower

Questions?

http://lunamark.com

http://bit.ly/ttf2016-wcfy

@paulmgower

ResourcesThe Mythical Man Month by Frederick P. Brooks Jr (http://www.amazon.com/The-Mythical-Man-Month-Engineering-Anniversary/dp/0201835959) Code Complete by Steve McConnell (http://www.amazon.com/Code-Complete-Practical-Handbook-Construction/dp/0735619670) Clean Code by Robert C. Martin (http://www.amazon.com/Clean-Code-Handbook-Software-Craftsmanship/dp/0132350882) Working Effectively with Legacy Code by Michael Feathers (http://www.amazon.com/Working-Effectively-Legacy-Michael-Feathers/dp/0131177052) FogCreek Software Blog

Effective Code Reviews - 9 Tips from a Converted Skeptic (http://blog.fogcreek.com/effective-code-reviews-9-tips-from-a-converted-skeptic/) Stop More Bugs with our Code Review Checklist (http://blog.fogcreek.com/increase-defect-detection-with-our-code-review-checklist-example/)

Write Code For The Future You - Tulsa TechFest 2016

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