map and grep are really pretty easy, once you know the secret: read them right to left.

map iterates over a list, executing the code block for each element in turn, returning a list of whatever the code block returns. Use it to transform one list into another.

grep iterates over a list, executing the code block for each element in turn, returning a list of only those elements for which the code block returns true. Use it to filter out list elements.

In reply to Re: Re: Re: Splice of ref to AoH not removing element by chromatic
in thread Splice of ref to AoH not removing element by bradcathey

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