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So far, we've done quite a lot. 
We've done primitive data and primitive 

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operations on that data. 
You learned, how to design functions 

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recipe and how to design data recipe and 
you also learned, how to design worlds 

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recipe. 
For designing world programs like 

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animations and games. 
Most recently, we looked at compound data 

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and learned how to use that in world 
programs. 

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But so far all of the data definitions 
we've worked with have been what's called 

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fixed size. 
And this week, we're going to add to our 

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repertoire, working with arbitrary-size 
data. 

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Now what do I mean by arbitrary-size 
data? 

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I mean the kind of data we use when we 
want to represent an unknown amount of 

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information. 
Information that we don't know upfront 

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how much there will be. 
So, for example, if we ant to represent 

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all of someone's favorite hockey teams, 
or all the students in a chorus. 

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We just don't know, how many of those 
that will be, up front and that's what we 

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need arbitrary sized data for. 
So, that's what we're going to work with 

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this week. 
We'll look at how to do the data 

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definitions. 
And we'll look at the effect that has on 

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functions we design on that data.