Specter https://github.com/nathanmarz/specter is a library for querying and "updating" data structures. For most things, I prefer it to zippers or hand-written descent functions. Specter's approach is similar to lenses, but I find it easier to understand and more featureful.

When starting out, I would have liked a short, exercise- and example-filled book on Specter. I'm thinking of writing that book.

Leanpub lets people indicate their interest on a book's webpage, which is here: https://leanpub.com/specter If you are, please do.

Brian Marick

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