Hello, I’m
Dave
@/+pragdave
2

Hello, I’m
a Ruby
Programmer
3

Hello, I’m
Agile
4

Hello, I’m
Dave
Hello, I’m
a Ruby
Programmer
Hello, I’m
Labels
Agile

Labels

Hello, I’m
Agile
7

Hello, I’m
Using index
cards

Hello, I’m
Using index
cards
Hello, I’m
Having stand-
up meetings

Hello, I’m
Hello, I’m
Using index
Doing unit
cards
testing
Hello, I’m
Having stand-
up meetings

Hello, I’m
Hello, I’m
Using index
Doing unit
cards
testing
Hello, I’m
Having stand-
up meetings
Hello, I’m
Refactoring

Hello, I’m
Hello, I’m
Using index
Doing unit
cards
testing
Hello, I’m
Having stand- Hello, I’m
up meetings Using
Hello, I’m Cucumber!!!
Refactoring

Why?
Because that is what
the Agile Experts tell
me to do
9

That is not agile…

Hello, I’m
Hello, I’m
Using index
Doing unit
cards
testing
Hello, I’m
Hello, I’m
That is sticking RSpec!!!
Having stand-
Using
up meetings
labels on yourself
Hello, I’m
Refactoring

Hello, I’m
a Ruby
Programmer
12

I need to write a
web application
13

y !
I need to write a
b
u
web application
R
13

I need automate
all my work
14

y !
I need automate
b
u
all my work
R
14

I need to do what is
best for my customer
15

y !
I need to do what is
b
u
best for my customer
R
15

I need world peace
16

y !
I need world peace
b
R u
16

Ru
by
!
17

Ru
by
!
17

Ru
by
!
17

Hello, I’m
a Ruby
Programmer
18

Which means…
19

Which means…
• I know:
19

Which means…
• I know:
• all 90 built-in classes and modules, and/or
19

Which means…
• I know:
• all 90 built-in classes and modules, and/or
• all 143,797 Rails methods, and/or
19

Which means…
• I know:
• all 90 built-in classes and modules, and/or
• all 143,797 Rails methods, and/or
• I’ve written my own testing framework
19

Which means…
• I know:
• all 90 built-in classes and modules, and/or
• all 143,797 Rails methods, and/or
• I’ve written my own testing framework
19

That is not a
Ruby Programmer

That is pouring
facts into your brain

Hello, I’m Hello, I’m
a Ruby
Programmer Agile
The Problem?

Hello, I’m Hello, I’m
a Ruby
Programmer Agile
Labels are static

Hello, I’m Hello, I’m
a Ruby
Programmer Agile
No Awareness

Hello, I’m
Hello, I’m
Using index
Doing unit
cards
testing
Hello, I’m
Hello, I’m
Having stand-
Using RSpec!!!
up meetings
Hello, I’m
Refactoring

That is not Agile
26

That is not Agile
This is Agility…
26

http://www.geology.smu.edu/~dpa-www/robo/nbot/nbot_gravel_1.mpg

t
de(t)
u(t) = P · e(t) + I · e( )d + D ·
0 dt
28

t
de(t)
u(t) = P · e(t) + I · e( )d + D ·
0 dt
Proportional
Integral
Derivative
29

t
de(t)
u(t) = P · e(t) + I · e( )d + D ·
0 dt
fix = current + history + future
error trend

fix = current + history + future
error trend
what “don’t how
to do panic” urgent

A. Where do we want to be?
B. Where are we?
C. How do we improve our position?
32

A. Where do we want to be?
B. Where are we?
C. How do we improve our position?
33

A. Where do we want to be?
B. Where are we?
C. How do we improve our position?
This is Agility
33

A. Where do we want to be?
B. Where are we?
C. How do we improve our position?
This is Agility
There is no more
33

Hello, I’m
a Ruby
Programmer
34

Hello, I’m
a Ruby
Programmer
34

Instead…
35

Instead…
• I like to solve people’s problems
35

Instead…
• I like to solve people’s problems
• I know how to use computers to do this
35

Instead…
• I like to solve people’s problems
• I know how to use computers to do this
• One of my (many) tools is the Ruby language
35

Instead…
• I like to solve people’s problems
• I know how to use computers to do this
• One of my (many) tools is the Ruby language
• I practice Ruby-do
35

Ruby-do?
36

Ruby-do
Object-orientation is not the only
way to program
37

Ruby-do
Sequential code is not the only way
to program
38

Ruby-do
“Good” code is not the only code
39

Ruby-do
40

Ruby-do
Ruby is not the best programming
language
40

Ruby-do
Ruby is not the best programming
language
(there is no “best” programming
language)
40

Ruby-do
for item in items items.each do |item|
process(item) process(item)
end end
41

Ruby-do
name = “Dave” name = “Dave”
location = “TX” location = “TX”
likes = “code” likes = “code”
42

1. Que0X said
February 21, 2008 at 13:04
got your point !, could you please explain advantage of learning
ruby over python? python already have a huge library from web to
Academia , while Ruby looks focusing on web stuff if i may tell !
what do you think ?
2. Akitaonrails said
February 21, 2008 at 14:52
@que0x I say you should learn both. period. no reason to learn
just 1.
http://webmat.wordpress.com/2008/02/20/do-not-learn-ruby/

Ruby-do
• Do you practice?
44

Ruby-do
• Confidence comes from practice,
not knowledge
• Constantly look for ways to practice
45

Because then…
• Distrust experts
• Distrust “best practices”
• Distrust labels
46

A Label Freezes You
A Label Defines You
A Label Makes You Simple

Don’t Label Yourself
You are what you do
48

Don’t Label Yourself
You are what you do
48

Be a VERB
not a NOUN
49

Do Good!
50