iterator adapter

A method that wraps an iterator to change what it produces, like map or filter.

An adapter is a lazy method that takes an iterator and returns a new iterator (map, filter, enumerate, zip, take, skip, flat_map, peekable).

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Examples

steps.iter().enumerate().filter(|(_, s)| **s >= 10_000) builds a new iterator of (day, steps) pairs; nothing runs until a consumer pulls from it.