programming_intro.md

!SLIDE

The Complete Beginner's Guide to Programming

!SLIDE

What is a program?

!SLIDE

!SLIDE

!SLIDE centereverything

!SLIDE

How do I write one?

!SLIDE

• Learn about customer's requirements
• Translate to "stories"
• Pick a story that seems doable
• Write code that does it
• Show your work to the customer, get feedback
• Based on feedback, adjust your stories
• When a story is done, go back to "pick a story"
• Repeat until app is finished!

!SLIDE

Let's start writing code!

!SLIDE

Windows	Mac OS X

!SLIDE centereverything

irb

!SLIDE

Variables

words that hold information

> my_variable = 5
=> 5
> my_other_variable = "hi"
=> "hi"

!SLIDE

Types of information

text, numbers...collections?

> fruits = ["kiwi", "strawberry", "plum"]
=> ["kiwi", "strawberry", "plum"]
> states = {"CA" => "California", "DE" => "Delaware"}
=> {"DE"=>"Delaware", "CA"=>"California"}

!SLIDE

Operators

doing stuff with variables

> my_variable + 2
=> 7
> my_variable * 3
=> 15
> my_fruits = my_fruits + ["lychee"]
=> ["kiwi", "strawberry", "plum", "lychee"]
> my_fruits = my_fruits - ["lychee"]
=> ["kiwi", "strawberry", "plum"]

!SLIDE

Loops

doing the same thing a bunch of times

> puts fruits[0] kiwi => nil > puts fruits[1] strawberry => nil > puts fruits[2] plum => nil

VS

> fruits.each do |f| * puts f > end kiwi strawberry plum => ["kiwi", "strawberry", "plum"]

!SLIDE

Conditionals

doing something only if a condition is met

> fruits.each do |f|
*   puts f if f == "plum"
> end
plum
=> ["kiwi", "strawberry", "plum"]

!SLIDE

Now we've done some Ruby...

...let's do some Rails!

!SLIDE centereverything

!SLIDE centereverything