[Jonathanks]

When I gave this book an attempt, I appreciated the author's honesty about the difficulty of the material. I went with Real World Ocaml instead, intending to reattempt SoFP in the future. Today I suggested an addition to a section in Real World OCaml, and the author pointed out that the section was already so dense that adding the extra content would require more explanation. I now appreciate the difficulty in making such a technical material approachable by a less technical audience, and a heads up is appropriate.

Edit: (in light of another reply that mentioned the lambda calculus). The addition to Real World OCaml that I suggested was to call out the implementation of the Y combinator in the section on Memoization. The explanation used the Y combinator to work up to an implementation of memoization, and it was so intuitive that I felt it should be noted, but that won't easily fit into an already dense chapter.