map can be faster because it's theoretically parallelizable, unlike for which is (generally) not.

The bigger point, though, is that by using map, you're telling me more about your intent with the code. map says "I'm doing something to each element, something that's probably easily described, and accumulating the result." On the other hand, for says "I'm doing something with each element and it could be anything."

My criteria for good software:
  1. Does it work?
  2. Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Re: map versus for by dragonchild
in thread map versus for by dHarry

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