A similar example is in a "filtering" operation. I mostly have this in functional programming where you pass a predicate to filter on. But what's the perspectiv

A similar example is in a "filtering" operation. I mostly have this in functional programming where you pass a predicate to filter on. But what's the perspective of the filter? Are you filtering poison from your water, or are you sifting the water looking for gold nuggets. I prefer to use functions remove and retain (respectively) to be more explicit.