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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…
Writing code you won't hate tomorrow
Writing code you won't hate tomorrow
No Tests.
Wrote his own framework.
500 line methods.
Used Singletons!
photo: Rob Allen (@akrabat)
Writing code you won't hate tomorrow
REWRITE
ALL THE CODE!
Real Developers,
SHIP STUFF.
photo: Glyn Lowe Photoworks
Writing code you won't hate tomorrow
Writing code you won't hate tomorrow
Writing code you won't hate tomorrow
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 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
Composer
PIE
Proudly

Invented

Elsewhere
guzzle/guzzle
HTTP client for RESTful API clients
photo by j_regan
morrisonlevi/ardent
A library of collections for PHP
Readability
photo: Morgenland
paragraphs
photo: Trossachs Photography
whitespace
Writing code you won't hate tomorrow
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
#1
Only one
indentation level
per method.
photo by: justinliew
#2
Do not 

use else
photo by: justinliew
Writing code you won't hate tomorrow
Writing code you won't hate tomorrow
Writing code you won't hate tomorrow
#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
we are hiring!
https://joind.in/11594
please rate me!
http://l.doh.ms/oc-links
Video recording
Slides
Books
Resources on 

Object Calisthenics

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Writing code you won't hate tomorrow