I'm not sure how useful an introduction it is, but I really enjoyed this talk: https://skillsmatter.com/skillscasts/4251-lenses-compositional-data-access-and-m

I'm not sure how useful an introduction it is, but I really enjoyed this talk: https://skillsmatter.com/skillscasts/4251-lenses-compositional-data-access-and-manipulation https://skillsmatter.com/skillscasts/4251-lenses-composition...