“Writing code that lasts” … or writing code you won’t hate tomorrow.

Writing code
that lasts.
Rafael Dohms 
@rdohms
photo: djandyw.com
#ocforphp

Writing code  
you won’t hate tomorrow.
Rafael Dohms 
@rdohms
photo: djandyw.com
#ocforphp

Rafael Dohms
or @rdohms on twitter

Developer
Herder
at AmsterdamPHP

Lead Backend
Developer
at Symbid

Let me
tell you about
someone else…

No Tests.
Wrote his own framework.
500 line methods.
Used Singletons!
shhh.. don’t tell Grumpy.
.. and used it.
.. and every other anti-pattern out there.
… not even methods, they were functions

REWRITE
ALL THE CODE!
image: hyperboleandahalf

Real Developers,
SHIP STUFF.
photo: Glyn Lowe Photoworks

How do we ﬁnd
balance?
photo: Kalexanderson

Code has an
expiration date
photo: CarbonNYC

Code is
perishable, it rots.
photo by: massdistraction

Code Evolves
photo by: kevin dooley

Languages evolve.
photo by: raneko

You evolve.
photo by: Kaptain Kobold

Complexity  
kills
Comprehension
photo: osbornb

NIH
source: Urban dictionary
photo by: John 'K'

NIH
| nɒt ɪnˈventɪd hɪə | 
Not Invented Here —The German art of humiliating any technology,
agricultural product, or (medical) scientiﬁc work that has not been
invented or produced in Germany, Switzerland, or Austria.
source: Urban dictionary
photo by: John 'K'

The Solution™
photo: Ian Sane

Improve code
make it easier to comprehend

Improve code
make it ﬂexible

Improve code
make it ﬂexible
make it tested

Improve code
make it ﬂexible
make it tested
make it easier to replace, refactor

Improve code
make it ﬂexible
make it tested
make it easier to replace, refactor
make it not exist

SOLID
Single Responsibility 
Open and Close 
Liskov substitution 
Interface Segregation 
Dependency Inversion
photo by j_regan

photo by loﬁnk
STUPID
Singleton 
Tight Coupling 
Untestability 
Premature Optimization 
Indescriptive Naming 
Duplication

Design Patterns
photo by halloweenstock

Package
Managers
photo by cocoachuchu.etsy.com

PIE
Proudly 
Invented 
Elsewhere

paragraphs
photo: Trossachs Photography

R&D Team for MIH/Naspers
São Paulo
Cape Town

Object
Calisthenics
photo by: boston_public_library

Calisthenics
/ˌkaləsˈTHeniks/
Calisthenics are a form of dynamic exercise consisting of a variety of
simple, often rhythmical, movements, generally using minimal
equipment or apparatus.
photo by: boston_public_library

Its about perception,
not rules or standards photo by: david_a_l

#1
Only one
indentation level
per method.
photo by: justinliew

#2
Do not  
use else

#3
Wrap primitive
types, if they
contain behavior

$component->repaint( new Animate(false) );

#4
Only one  
-> per line

#5
Do not
abbreviate.

if($sx >= $sy) {
if ($sx > $strSysMatImgW) {
$ny = $strSysMatImgW * $sy / $sx;
$nx = $strSysMatImgW;
}
if ($ny > $strSysMatImgH) {
$nx = $strSysMatImgH * $sx / $sy;
$ny = $strSysMatImgH;
}
}

#6
Keep your
classes small.

#7
Limit your
instance variables
to less then 5

#8
Use ﬁrst class
collections

#9
Don’t use getters
and setters.

#10
Document
your code.

Try Object Calisthenics
for a month.

Thank you.
http://slides.doh.ms
http://doh.ms
@rdohms
we are hiring!
http://careers.symbid.com

http://l.doh.ms/oc-material
Video recording
Slides
Books
Resources on  
Object Calisthenics

“Writing code that lasts” … or writing code you won’t hate tomorrow.

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