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In designing complex systems, it's 
important to break the big problem down 

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into smaller and smaller pieces. 
We've see that idea again and again 

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throughout the course. 
But in the next few videos, we're 

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going to look at another idea for 
managing the complexity of big systems. 

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This idea has to do with reducing the 
amount of repetition in our code. 

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It's a concept called abstraction, and 
the way it's going to work, is that we're 

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going to take function definitions, cases 
where we have two or more examples of 

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very similar functions and pull out from 
them, a more general function, which will 

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let us later plug in the details of the 
different functions. 

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So we're going to get less code, and more 
of our code will be more general or more 

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abstract. 
It's going to be kind of fun, and what's 

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going to happen here is that all of this 
discipline you've learned about type 

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comments and templates and template 
rules, well all of that's going to pay 

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off in a really big way in these videos.