Is there an efficient way to shift a list and be guaranteed to shift past undef'd list members? I need the numbered insertions to keep track of events in a turn-based system, and need to keep the list constantly shrinking so passed events don't keep on taking memory, but the list will be mostly empty, with probably about 5% of the members being full. I want to avoid the need to pass by all the members that are not defined for speed reasons.

In reply to Efficient access to sparse lists? by Improv

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