when code cries: listening to code
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BT10 Concurrent Session 11/14/2013 3:45 PM
"When Code Cries: Listening to Code"
Presented by:
Cory Foy Cory Foy, LLC
Brought to you by:
340 Corporate Way, Suite 300, Orange Park, FL 32073 888‐268‐8770 ∙ 904‐278‐0524 ∙ sqeinfo@sqe.com ∙ www.sqe.com
Cory Foy Cory Foy, LLC
A passionate technical executive, developer, blogger, and speaker, Cory Foy has more than sixteen years of software and technology experience, and ten years of agile and lean methods experience. His background includes work in the health care, financial, and technology sectors, serving as a Premier Field Engineer and Team System Ranger for Microsoft; consulting with DirecTV, Stratos Global, and Invensys as a senior consultant for Net Objectives; and architecting solutions for organizations such as MIT's College of Engineering while at 8th Light. Cory's blog coryfoy.com was ranked as one of the top 100 Agile blogs. You can find Cory on Twitter @cory_foy and on LinkedIn at linkedin.com/in/coryfoy.
When Code Cries
Cory Foy@cory_foy
foyc@coryfoy.comhttp://www.coryfoy.com
Bad Code
Is this quality code?
Is this quality code?
Is this quality code?
“Code that actually gets used”
Is this quality code?
“Code that actually gets used”
“Lots of merged in pull requests”
Is this quality code?
“Code that actually gets used”
“Lots of merged in pull requests”
“Quality code makes me say, "hmm," not
"ick."”
Is this quality code?
“Code that actually gets used”
“Lots of merged in pull requests”
“Quality code makes me say, "hmm," not
"ick."”
“If, when used, it pleases the user”
“The specific patterns out of which a building or a town is made may be alive or dead. To the extent they are
alive, they let our inner forces loose, and set us free; but when they are dead, they keep us locked in inner
conflict.”Christopher Alexander - “The Timeless Way of Building”
Code Smells
Code Talks
Code Cries
Because No One Understands What It Is
Saying
Code Cries
So?
So?
So?
http://www.flickr.com/photos/bunchofpants/99848415
“...we have so far beset ourselves with rules, and concepts, and ideas of what must be done to make a
building or a town alive, that we have become afraid of what will happen naturally, and convinced that we must
work within a “system” and with “methods” since without them our surroundings will come tumbling
down in chaos.”Christopher Alexander - “The Timeless Way of Building”
Ten Thousand Hours
Ten Thousand Hours
Ten Thousand Hours
Functional ProgrammingImperative Programming
Logic ProgrammingStatic Typing
Dynamic Typing
Coding Standards Define Dialects
BICS
CALP
BICS
CALP
BICS
CALP
ContextReduced
ContextEmbedded
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
- Copying from the board- Reading a Map- Face to Face Conversation- Selecting food in the lunchroom
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
- Copying from the board- Reading a Map- Face to Face Conversation- Selecting food in the lunchroom
- Following a class schedule- Telephone Conversation- Oral Presentations- Getting an absence excuse
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
- Copying from the board- Reading a Map- Face to Face Conversation- Selecting food in the lunchroom
- Following a class schedule- Telephone Conversation- Oral Presentations- Getting an absence excuse
- Demonstrations- Basic Math Computations- Science Experiements
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
- Copying from the board- Reading a Map- Face to Face Conversation- Selecting food in the lunchroom
- Following a class schedule- Telephone Conversation- Oral Presentations- Getting an absence excuse
- Demonstrations- Basic Math Computations- Science Experiements
- Standardized Tests- Math Concepts and Applications- Listening to a Lecture
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
Foy-Z
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
Katas
Foy-Z
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
Katas Koans
Foy-Z
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
Katas Koans
Adding a new Feature
Foy-Z
BICS
CALP
ContextReduced
ContextEmbedded
Cognitively Undemanding
Cognitively Demanding
Katas Koans
Adding a new Feature
Listening to Code
Foy-Z
Listening to Code
http://www.flickr.com/photos/jn2race/263149573
Listening to Code
Decide to listen
http://www.flickr.com/photos/jn2race/263149573
Listening to Code
Decide to listen Listen for the whole message
http://www.flickr.com/photos/jn2race/263149573
Listening to Code
Let go of your own personal
agenda
Decide to listen Listen for the whole message
http://www.flickr.com/photos/jn2race/263149573
Listening to Code
Let go of your own personal
agenda
Decide to listen Listen for the whole message
Be patient
http://www.flickr.com/photos/jn2race/263149573
Listening to Code
Let go of your own personal
agenda
Decide to listen
Be curious
Listen for the whole message
Be patient
http://www.flickr.com/photos/jn2race/263149573
Listening to Code
Let go of your own personal
agenda
Decide to listen
Be curious
Listen for the whole message
Be patient
Test for understanding
http://www.flickr.com/photos/jn2race/263149573
4 Rules of Simple Design
Does this code express all of the ideas we want to
express?
Are there concepts from our domain
that can be expressed?
Commonality/Variability Analysis
What is common? What varies?
Is it easy to swap the things that vary?
Is it easy to identify the things that are
common?
Fowler’s Perspectives (from UML Distilled)
Are we operating at the right level -
Conceptual, Specification or Implementation?
SOLID Principles
Do we have duplication
(implementation or conceptual)?
Single responsibilities?
LoD violations?
LSP violations?
To Listen, We Must Understand
To Listen, We Must Understand
To Understand, We Must Practice
To Listen, We Must Understand
To Understand, We Must Practice
To Practice, We Must Have Context
To Listen, We Must Understand
To Understand, We Must Practice
To Practice, We Must Have Context
To Listen, We Must Understand
To Understand, We Must Practice
To Practice, We Must Have Context
Cory Foy @cory_foy
foyc@coryfoy.comhttp://www.coryfoy.com
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