It's identical to what you'd use for a breadth-first search (as an iterator or otherwise) except then you'd use a queue instead of a stack for a breadth-first search. In both cases, you need to save the search state in a local var rather than using recursion to save it on the system stack.

In reply to Re^3: An iterator for (not "iterating") a recursive data structure. (terser) by ikegami
in thread An iterator for (not "iterating") a recursive data structure. by BrowserUk

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