Notes: Monday 15 March 2004

Schedule

• Monday, 22 March: Problem Set 6
• Exam 2 will be handed out on 14 April and due on 19 April.

(define (make-ocounter) ((lambda (count) (lambda (message) (if (eq? message 'reset) (set! count 0) (if (eq? message 'next) (set! count (+ 1 count)) (if (eq? message 'how-many) count))))) 0))

(define (make-ocounter) (let ((count 0)) (lambda (message) (if (eq? message 'reset) (set! count 0) (if (eq? message 'next) (set! count (+ 1 count)) (if (eq? message 'how-many) count))))))

What is an object?

How to Smalltalk-ers add 2 + 3?

Why is it useful to package state and procedures together?

Who was the first object-oriented programmer?

Recommended Reading: Howard Rheingold, Tools for Thought, Chapter 11: The Birth of the Fantasy Amplifier.

TerraServer
1 Terabyte = 2⁴⁰ bytes (about 1 Trillion bytes)

http://terraserver.microsoft.com/ — 3.3 Terabytes of aerial images covering entire United States
     UVa Image

The best way to predict the future is to invent it. — Alan Kay
If you have an idea, and its not a good idea, take a nap instead of implementing it. — Alan Kay