Well, kinda. With grep, for each item you can only:

• Leave the item alone and not include it in the result
• Modify the original item and not include it in the result
• Include the original item, unmodified, in the result
• Modify the original item and include this exact same modification in the result

With map you can do all of the above and also do:

• Leave the item alone and include one or more values in place of that item in the result
• Modify the item and include one or more values in place of that item in the result, with the ability to even include the original (unmodified) item in the result.

So using grep to return something other than a subset of the original list is quite restricted and is probably an indication that you shouldn't be using grep. (:

        - tye (but my friends call me "Tye")

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