flipboard challenge solution.

flipboard.js

var s = ''
var result = ''

var step = async (x, y, last) => {
  const response = await fetch(`/step?s=${s}&x=${x}&y=${y}`)
  const json = await response.json()
  const adjacent = json.adjacent.filter(
    item => JSON.stringify(item) !== JSON.stringify(last)
  )
  if (json.end) {
    return json.letter
  }
  for (let i = 0; i < adjacent.length; i++) {
    const letter = await step(adjacent[i].x, adjacent[i].y, { x, y })
    if (letter) {
      return json.letter + letter
    }
  }
}

var check = async () => {
  const response = await fetch(`/check?s=${s}&amp;guess=${result}`)
  const json = await response.json()
  return json.success
}

var begin = async () => {
  const params = new URLSearchParams(location.search)
  s = params.get('s')
  result = await step(0, 0, { x: 0, y: 0 })
  console.log('result:', result)
  const bool = await check()
  console.log(bool)
}

begin()