Haystack needle recursive

gistfile1.txt

findKey = (haystack, needle) => {
    let found = false
    const iterate = (obj) => (
      Object.keys(obj).forEach((key) => {
        if (found === false) {
          if (key === needle) {
            found = key
          } else if (obj[key] && typeof obj[key] === 'object') {
            iterate(obj[key])
          }
        }
      })
    )
    if (haystack && typeof haystack === 'object') {
      iterate(haystack)
    }
    return found
  }
}