ruby_for_beginners.md

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The Complete Beginner's Guide to Programming

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What is a program?

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Operating Systems

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Applications

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Web Application In Rails

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How do I write one?

• 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!

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Let's start writing code!

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• Windows: git bash

• Mac OS X: Terminal

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$ irb

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Variables

words that hold information

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

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Types of information

text, numbers...collections?

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

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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"]

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Loops

doing the same thing a bunch of times

The hard way:

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

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Loops

doing the same thing a bunch of times

The easy way:

>> fruits.each {|f| puts f}
kiwi
strawberry
plum
=> ["kiwi", "strawberry", "plum"]

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Loops

The easy way, with "do...end" rather than "{...}"

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

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Conditionals

doing something only if a condition is met

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

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Sinatra

hello.rb

@@@ Ruby
require 'rubygems'
require 'sinatra'

get '/' do
  "<b>Hello, <i>bang bang</i>!"
end

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Sinatra

$ gem install sinatra
$ ruby hello.rb
== Sinatra/1.2.6 has taken the stage on 4567 for development with backup from Thin
>> Thin web server (v1.2.7 codename No Hup)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:4567, CTRL+C to stop

then open a browser to http://localhost:4567/

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Now we've done some Ruby...

...let's do some Rails!

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Web App Network Architecture

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Web App MVC Architecture