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Factor … scales horribly both with respect to lines of code per word (function) and the amount of local state (number of variables). This is because local state is manipulated on a stack which you have to keep track of in your head. …
So instead you’re constantly having to come up with neat composable abstractions to fold up the state. This is the sort of thing that makes code elegant, loosely coupled and small in any language. …
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And more on the same subject from the same author: Factor makes you write better code