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
[email protected]: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