Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• A quick overview of Ruby.
• Setting up your first Rails app.

Preliminaries

Admin

• I'm still working on getting the other Web sites for the class set up.
  I'll let you know as soon as I do.
• Our book says to use Bitbucket, but I'm comfortable using Github, and you'll find that the instructions work more or less the same. You can use whichever you'd like.
• Handout: Academic honesty policy.
  • Read.
  • Sign if possible.
  • Discuss if not.
• Albert apologizes for lying to some of you.

Upcoming Work

• For Friday: Finish Chapter 1 of Hartl (including all construction).
• 8pm Thursday: Reading Journal on Hartl, Chapter 1
  • Message subject: CSC 321 Journal Day 3 (Your Name)
  • What, in your own words, is the MVC framework? Why do programmers use such a framework?
  • Which task was the most difficult for you to complete? What instructions would have helped you get through that task faster?
  • If you wanted https://yoursite.c9users.io/goodbye to show the text "Thanks for Visiting", what steps would you do?
  • What is something you found particularly confusing or puzzling in the reading?

Good Things to Do

Academic

• Convo Thursday!, 11 am in JRC 101.
• CS Extras Thursday! Summer research opportunities at Grinnell.

Peer

• Track meet on February 6, Field House.

Questions

A quick overview of Ruby

• Modern programming language.
• "One" designer.
• Imperative, functional, and OOP characteristics.
• Good at "Get the job done quickly."

Cool things about Ruby

• Too many ways to express the same concept.

  if TEST consequent
  consequent if TEST
  if TEST
    consequent
  end
  unless not TEST
    consquent
  end
  consequent unless not TEST
  

• Everything (more or less) is an object

• Yay! There are anonymous functions (with multiple syntaxes and subtle differences, because it's Ruby)
• Conditional assignment
• It's expressive, and can likely match your model of expressiveness.

Setting Up Your First Rails App

• We'll spend the majority of class time working on working on chapter 1 of Hartl.
• As a good CS student, you should go beyond the particular instructions at times and try variants. How do names come into play?
• Warning! Way too much of modern software design is "convention"

The following instruction takes way too long

$ rails _4.2.2_ new hello_app
     .
     .
     .
     run  bundle install

I think you can safely hit ^C once it hits the bundling. Then edit your Gemfile (as instructed in the book), and then type bundle install on the command line. (When you do that, it will still take a long time, but a bit less. Read ahead in the book while it is installing.)