I recommend this post as well: https://medium.com/@gcanti/introduction-to-optics-lenses-and-prisms-3230e73bfcfe https://medium.com/@gcanti/introduction-to-optic

I recommend this post as well: https://medium.com/@gcanti/introduction-to-optics-lenses-and-prisms-3230e73bfcfe https://medium.com/@gcanti/introduction-to-optics-lenses-and... The author of the post is also the author of a TypeScript port of Monocle for Scala.