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there are currently no transformations in there that filter, but it could. I just don't know what you would filter. If there was a reason, then yes, one of these pipe operations would filter, but what they usually do is transform data from one form to another. (from a parser spec to a code file for example)
It works as a pipeline of transformations essentially. Imagine XSLT except not, and you could pipe them together.
When I was growin' up, I was the smartest kid I knew. Maybe that was just because I didn't know that many kids. All I know is now I feel the opposite.