CSC302 2011S, Class 06: Io (2)

Overview:
* Why Io?
* Lab.

Admin:
* I understand that Assignment 2 took somewhat longer than I'd anticipated.  What were the hurdles?
  * #5, define_method was difficult to figure out
  * Students did not know graph traversal algorithms
  * Ruby's operations are not intuitively named
* Assignment 3 is now ready.
* Few of you asked or answered questions on Tate 3.3.  Why?
* EC for CS table today.
* Absent: SA, DR, AR, DV

Why Io?
* Simple syntax
* Small language
* A very different model of object-oriented programming
* Lots of concurrency support
* Fun parsing and operation model
* Reveals the underlying implementation

Lab Io1

Lab Io2:

Exercise 1
* How do I figure out an object's slot names?
  * Try looking at its type or proto (or both)

Exercise 2
* How do I define the + operator
Number + = method(...)