On abstractions and pure functions

[Erik Assum]

I'm somewhere in the chapter on abstractions (rather specifically on page 83), and a thought struck me.

You're writing about the assumptions we make about our environment, and it strikes me that a pure 

function seems to make no assumptions about its environment, since it only relates to it input params?

Don't know if it means anything, but thought I'd mention it any way.

Erik.

[Zach Tellman]

Hey Erik,

The environment is also what invokes the function, and any in Clojure any function other than `identity` makes some assumptions about what it's being passed.  I know that defining the environment as "everything else" is a little amorphous, if that wasn't clear I should think about how to make it more so.

Zach

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