CSC 216/s08/be cheerful: Difference between revisions
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# The coder first creates two or more people classes that are supposed to do the Hokey Pokey, by telling them individually how to do the hokey pokey. | # The coder first creates two or more people classes that are supposed to do the Hokey Pokey, by telling them individually how to do the hokey pokey. | ||
# | #* Because he has a bad memory, he forgets to tell one to "turn himself about" and to do the incorrect 2nd action. | ||
# The "classes" dance the first 2 segments (right foot, left foot) and get it wrong. | # The "classes" dance the first 2 segments (right foot, left foot) and get it wrong. | ||
# The coder decides to use superclassing and inheritance so that all of his people share the same instructions, so he shows the video. | # The coder decides to use superclassing and inheritance so that all of his people share the same instructions, so he shows the video. | ||
Revision as of 17:56, 25 March 2008
That's what it's all about!
The problem
Teach the value of superclassing and writing DRY code to prevent error.
Participants
3 group members: 1 programmer and 2 classes the he writes, played by volunteers
Hokey Pokey Music/Video Candidates
- http://video.google.com/videoplay?docid=-4742763335053216439
- http://video.google.com/videoplay?docid=8805519462208735145
The script
- The coder first creates two or more people classes that are supposed to do the Hokey Pokey, by telling them individually how to do the hokey pokey.
- Because he has a bad memory, he forgets to tell one to "turn himself about" and to do the incorrect 2nd action.
- The "classes" dance the first 2 segments (right foot, left foot) and get it wrong.
- The coder decides to use superclassing and inheritance so that all of his people share the same instructions, so he shows the video.
- They dance the next 2 segments (right arm, left arm) right!
- The best part is that now that the coder has a superclass, I can extend HokeyPokey to as many classes as I want! Like... the whole class! ;)
- Those willing can watch the video and do the hokey pokey with us. :D
- Reiterate how this example applies to real programming.