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filter and/or filter! #87

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rikhuijzer opened this issue Dec 22, 2021 · 0 comments
Open

filter and/or filter! #87

rikhuijzer opened this issue Dec 22, 2021 · 0 comments

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@rikhuijzer
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Would it make sense for this package to define filter and/or filter!?

I've looked into the implementation and guess that this issue boils down to: Is there a kind of null element defined for abstract trees? If yes, then a PreOrderDFS could replace elements by null and that should work, I think.

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