[coldtea]

>"filter" has to be the worst library name. I have no clue what it's doing unless I read the documentation

It, I dunno, FILTERS a collection keeping only certain elements (those that match the filter)? What else would it possibly do? Besides a standard CS term, it's also a concept from real life...

To me the name is crystal clear.

[andrewprock]

A filter creates two sets, one with the thing, and the other without. When you filter something, you might be interested in what is filtered in, or what is filtered out.

Ponder for a second the phrases, "filtered water", "coffee filter", "camera filter", etc. In all of those cases, you are interested in the set without the filtered thing, not with.

Compare this to "select" which is a much clearer name.

[coldtea]

>Ponder for a second the phrases, "filtered water", "coffee filter", "camera filter", etc. In all of those cases, you are interested in the set without the filtered thing, not with.

Filtered is akin to "cleansed" (it refers to the "main body") not akin to "picked out" (which would have applied to the undesirable elements.

It's actually the water (or the light, in the case of camera filter) that's filtered (hence the name "filtered water" and not "filtered dust and detritus").

The other stuff is not what's being filtered -- just what's "filtered out".