he/him 
E.g. Dropdown passed to a menu item as children that only shows on http://state.active . Wrapping in a closure seems really gross
What @reactjs patterns are there to prevent building subtrees of components that aren't used and are tossed away?
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not sure i understand but maybe I do, and I use render callbacks.
@reactjs
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I put a lot of ternaries inline in my JSX. Branches that I don't take don't ever execute.
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return <div>{showSubTree && <SubTree/>}</div>?
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maybe prematurely optimizing? in the 'children' case, if they aren't rendered in the receiving component then the cost is low
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