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

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

Let me
introduce
you to
someone…

No Tests.
Wrote his own framework.
500 line methods.
Used Singletons!

photo: Rob Allen (@akrabat)

REWRITE
ALL THE CODE!

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

Bad Design
photo: miskan

Bad specs

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

Improve code
make it easier to comprehend

Improve code
make it easier to comprehend
make it flexible

Improve code
make it easier to comprehend
make it flexible
make it tested

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

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

Good Design
Concepts

SOLID
Single Responsibility
Open/close
Liskov substitution
Interface segregation
Dependency inversion

STUPID
Singleton
Tight Coupling
Untestability
Premature Optimization
Indescriptive Naming
Duplication

Composer

PIE
Proudly
Invented
Elsewhere

guzzle/guzzle
HTTP client for RESTful API clients

morrisonlevi/ardent
A library of collections for PHP

Readability
photo: Morgenland

paragraphs
photo: Trossachs Photography

whitespace

R&D Team for MIH/Naspers
São PauloCape 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

Sunday
12:00
Voyager Room

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

#2
Do not
use else
photo by: justinliew

#3
Wrap primitive
types, if they
contain behavior
photo by: justinliew

#4
Only one
-> per line
photo by: justinliew

#5
Do not
abbreviate.
photo by: justinliew

#6
Keep your
classes small.
photo by: justinliew

#7
Limit your
instance variables
to less then 5
photo by: justinliew

#8
Use first class
collections
photo by: justinliew

#9
Use getters
and setters.
photo by: justinliew

#10
Document
your code.
photo by: justinliew

Your turn.

Improve
yourself!

Read lots of
code!

Write simple
code.

Try Object Calisthenics
for a month.

Use someone
else’s code.

Share bite size
libraries.

Thank you.
http://slides.doh.ms
http://doh.ms
@rdohms

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