a) for = flip map https://groups.google.com/d/topic/elm-discuss/DJXr8LIHYjY/di...
b) A signal/behavior based API for persistent storage: https://groups.google.com/d/topic/elm-discuss/oId_OHfG5G8/di...
Finally, independent of Elm there's a new FRP library for Guile scheme: http://dthompson.us/functional-reactive-programming-in-schem...