Lenses, Stores, and Yoneda Posted by Bartosz Milewski under Category Theory, Functional Programming, Haskell, Lens, Programming [13] Comments Edward Kmett’s lens library made lenses talk of the town. This is, however, not a lens tutorial (let’s wait for the upcoming Simon Peyton Jones’s intro to lenses (edit: here it is)). I’m going to concentrate on one aspect of lenses that I’ve found intriguing