mi study group

We will improve our programming skills by meeting weekly and working on programming stuff.

Topics

• ruby
• ruby on rails
• rspec, cucumber
• coffeescript
• git: forking on github
• unix/linux command line
• development tools / IDEs: RubyMine, vim, sublime text
• managing / setting up a webserver

Schedule

week 2

Who: Stephen
When:
Where: DevCave
What: Ruby and RTanque: Battle day
Prep:
ruby-doc.org ::: Bookmark it!
If you didn't do the quick start (below) before, do it for this time.
Fork steptan's RTanque github repo so you can share your bot via pull request
git@github.com:steptan/RTanque.git
come ready to battle

week 1

Who: Stephen
When: Tue Mar 5 6:30 AM 2013
Where: DevCave
What: Ruby and RTanque
Prep:

Quick Start: (run from the command line)

mkdir rtanque; cd rtanque  
echo '1.9.3' > .ruby-version  
bundle init  
echo "gem 'rtanque'" >> Gemfile  
bundle  
bundle exec rtanque new\_bot my\_bot  
bundle exec rtanque start bots/my\_bot sample\_bots/keyboard sample\_bots/camper:x2  

Drive the Keyboard bot with asdf. Aim/fire with the arrow keys
http://awilliams.github.com/RTanque/

Challenge questions

• Why doesn't 'git status' complain about the rtanque subfolder?
  • ANSWER: You have the folder "/rtanque/*" listed in the .gitignore file. first:Miles
• Who has forked this git repo on github?
  • COOLEST FIRST:

What we've learned so far:

week 1 (20130305)

Ruby basics

• everything in Ruby is an Object
• Object are created from Classes
• every Class extends another class, all the way back to Object
  For example, numbers are objects, too
  arithmetic operators are just method calls
  so + is a method on the Number class

3 + 3 #(is the same as) 
3.+(3)  

Classes

• Class-wide values accessed by appending :: to class name
  • Static constants: Math::PI
• Classes can be "instantiated" to create "instances" which are Object
• Variables point to Object
• Instance variables persist across method calls and have a @ prepended @lives = @lives - 1
• ruby constructor: initialize
• each time a Class is instantiated
  • a new Object is born
  • its initialize method is called
  • initialize method takes 1 argument

    def initialize(blah)
      @radar = 0.0
    end

• every Class inherits from the Object class
• ruby returns the last thing in your method
• duck typing
• + is actually a method (same for *, -, / etc)
• every method returns the last thing
• irb is a great way to quickly test stuff and learn Ruby from the command line __ Try this in irb:__
  you can concatenate Strings in Ruby

    "Hi," + " there"

you cannot do this:

    5 + " little monkeys"

why not? duck typing. Ruby finds 5, wants to do arithmetic

    5 + 5

this works:

    5.to_s + " little monkeys"

because now Ruby can concatinate 2 Strings: "5" and " little monkeys"

week 0

markdown cheat sheet

• to force a line break, end a line with two spaces
• to make a link,
  • put the text of the link in square braces
  • put the link inside parenthesis