I find that teaching people that map means basically "Transform", and that reduce is basically "Sum" helps most people. To be fair reduce can be more than summing, but map is really transforming the data so its helpful to think that way I've found.
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I find that teaching people that map means basically "Transform", and that reduce is basically "Sum" helps most people. To be fair reduce can be more than summing, but map is really transforming the data so its helpful to think that way I've found.