in reply to Foreach for array pruning?

If a grep could work in place that would be the answer - but it can't. That pretty much doubles the amount of time it takes to work on the array - the assignment back to the original list.

Are you sure that the 5.8.x series does this? I was under the impression that the same map optimizations were applied to grep when assigning to the same list.

Not to mention, why on earth are you trying to optimize grep? This smells like a case of premature optimization ...

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