Class 2: Getting started with Ruby
Held: Wednesday, 25 January 2017
We start to investigate some issues in Ruby.
- A brief introduction to Ruby
- Some exercises
News / Etc.
- Welcome to day two of CSC 321!
- Yes, I will take attendance.
- Today and Thursday, we will continue to explore the wonders of Ruby.
- Your mentor will be giving up some class time to have evening mentor sessions (increasingly so as the first half of the semester continues).
- I’m still working on the course Web site.
- Yes, I know the assignments were time-consuming. But we want you to practice getting up to speed quickly. I’m limiting the work for Thursday.
- Some concerns and comments
- If I’m going to use your reading journals to prepare class, I really do need them in on time. (That’s my fault for not giving a clear due time.) They will be due at 8 p.m.
- When I write “Email your ids for the various services to the mentor and to me”, that means you should send it to both of us.
- Please follow the instructions for giving titles to email messages. You should know why.
Good things to do
- Community time today at 11:00 am in JRC 101.
- CS Table today in the Whale Room.
- CS Extras Thursday at 4:15 pm.
- Rosenfield Symposium next week.
A Quick Overview of Ruby
- Modern programming language.
- “One” designer.
- Imperative, functional, and OOP characteristics.
- Good at “Get the job done quickly.”
What’s something familiar?
What’s something new and exciting you’ve discovered about Ruby?
How does Ruby handle a programmer’s need for multiple inheritance?
What is something particularly confusing or puzzling in the reading?
Some Ruby Problems
sums_to_n?(vals,val) that returns true if any pair
of values from
vals sums to
multiple_of_4?(bitstring) that takes a string of 0’s and 1’s
(representing an unsigned integer) as input and returns true if the
string represents an integer divisible by four.
starts_with_consonant?(str) that determines if a string
starts with a consonant.