The clean-up step may seem strange, but it’s a memory-usage optimization. When a language runtime executes a series of function calls it does not need to keep already-exited stack frames around. Branching function calls only form a tree in the time dimension; at any given snapshot in time there exists only a single stack of function calls in memory, tracing the current path through the tree. If we did not set our child frames to null we would end up building the whole tree up in memory and retaining it until the recursive processing is complete. Removing references to them allows the runtime to reclaim their memory at its leisure. If you’ve ever wished that you could deal with manual memory management in JavaScript, now’s your chance!
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the difference is that every operation works on decision trees instead of individual nodes, and the combining operations (union, intersection, complement) know how to merge two trees by splitting on shared conditions. the result is that you compute one derivative per state instead of let’s say, 256 for a byte, and the minterms fall out for free.，这一点在今日热点中也有详细论述
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