Getting to know DrRacket

This is the second week of learning how to use DrRacket. Unlike the first week when I knew nothing about it, this week I started to understand how to use it to define functions. In this week of classes, I learnt that "pic: hacker" and "pic: calendar" are the names of two built-in images. I also learnt that how to make my own definitions, such as the definition of the function lolcatz. One "check-expect" is corresponding to one "define". I can define a picture using a simple expression rather than copying and pasting the image again and again. For example, I can define a picture of apple using "p1".

Also, throughout watching the videos of DrRacket, I learnt some codes for composing pictures and changing the scales of pictures.

In class, I enjoyed watching people doing demonstrations of expressing letters using seven digits of numbers. The activity was fun.

The quiz this week was not hard. But what frustrates me is the history of computer machines. I need to memorize too much information including the time period, the names of those machines. I think I'll take a look at the notes that are posted on our course website and try to understand those things.