Lenses for the Mere Mortal: PureScript Edition

Lens libraries, such as Haskell’s Control.Lens or PureScript’s Data.Lens, have the reputation of
being hard to learn, or at least hard to learn well. That’s not to say that lots of people haven’t learned
them. Many have. But many others have had a hard time, me included.
This book teaches lenses differently. I don’t claim I’ve found the single best way to teach them, just
that this way is worth a try, whether you’re learning lenses for the first time or you’ve bounced off
some other tutorial that didn’t work for you.