Wolf, goat, cabbage blog post

first.js

const animals = ['wolf', 'goat', 'cabbage']

boat.init(animals)
boat.load(animals[0])
boat.moveToNext()
boat.moveToNext()

//The next step is to load the cabbage
boat.load(animals[2])
// Crash!

solution.js

// The actions need to happen at a certain order.
// Otherwise the internal state of the boat object will corrupt.
// See this issue and discussion why an invalid state is possible using the transport library
// https://github.com/folklore-riddle/transport/issues/12

// Further documentation https://en.wikipedia.org/wiki/Wolf,_goat_and_cabbage_problem
function transferAnimals() {
  // TODO There is a new version of the boat API in the making https://github.com/folklore-riddle/transport
  // When the version is released, this function will be updated to use the new version.
  boat.initialize(animals);
  // `boat.load` is a bit awkward, but we have contributed to a PR open which simplifies it.
  // Please see https://github.com/folklore-riddle/transport/pull/22
  boat.load(GOAT_INDEX);
  boat.moveToNextBank();
  boat.unload();
  boat.moveToNextBank();
  boat.load(WOLF_INDEX);
  boat.moveToNextBank();
  boat.unload();
  // NOTE! There is an issue in the boat state which causes the GOAT index be unloaded if we dont load the GOAT here.
  // Issue https://github.com/folklore-riddle/transport/issues/53
  boat.load(GOAT_INDEX);
  boat.moveToNextBank()
  boat.unload()
  boat.load(GABBAGE_INDEX)
  boat.moveToNextBank()
  boat.unload()
  boat.moveToNextBank();
  boat.load(GOAT_INDEX)
  boat.moveToNextBank()
  boat.unload()
}

working-solution.js

function transfer() {
    boat.initialize(animals)
    boat.load(1)
    boat.moveToNextBank()
    boat.unload()
    boat.moveToNextBank()
    boat.load(0)
    boat.moveToNextBank()
    boat.unload()
    boat.load(1)
    boat.moveToNextBank()
    boat.unload()
    boat.load(2)
    boat.moveToNextBank()
    boat.unload()
    boat.moveToNextBank();
    boat.load(1)
    boat.moveToNextBank()
    boat.unload()
}