Derive flip from map

const flip = (f, x) => map(T(x), f)

flip(a => b => a - b, 1)(5) //> 4
flip({a: x => x - 1, b: x => x + 1}, 1) //> {a: 0, b: 2}

See https://hackage.haskell.org/package/functors-0.1/docs/Data-Functor-Syntax.html#v:flip

[Avaq]

I believe all of this will fall into place once simple currying lands.

[davidchambers]

Something about having S.flip operate on an uncurried function doesn’t sit well with me, Gabe.

In fact, now that we have S.curry2 and S.curry3 I think we should consider removing S.encase2_ and similar _-suffixed functions.