Function ap

src/interop/static-land.js:31–33

(obsFn, obsVal)

  // it must have the same behavior as hand-written method. We intentionally violate the spec
  // in hope that it won't cause many troubles in practice. And in return we have more useful type.
  ap(obsFn, obsVal) {
    return combine([obsFn, obsVal], (fn, val) => fn(val))
  },

  chain(fn, obs) {
    return obs.flatMap(fn)