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Re:Dhall: A Gateway Drug to Haskell by ParetoOptimal on Wednesday June 08, 2022 @11:07AM (#31668429)
Good examples in "Putting lenses to work" by John Weigley:

https://youtube.com/watch?v=QZy4Yml3LTY

Then for a great book that gives a great understanding see Chris Penner's amazing and fun "Optics by example:

https://leanpub.com/optics-by-example

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