code: function getWish(id) {
    if (_isArray(id)) {
      const wishes = []
      _each(_getWishIndexById(id), index => {
        wishes.push(_wishes[index])
      })
      return wishes
    } else {
      const index = _getWishIndexById(id)
      if (index > -1) {
        return _wishes[index]
      } else {
        return null
      }
    }
  }
docs: Get a specific wish by an id.
  If the id is an array, returns an array
  of wishes with the same order as the
  given array.
  Note: If the id does not correspond to
  a registered wish, it will be undefined
  @param {wishIds} id The id(s) to get wishes for
  @returns {wish|Array.<wish>|null} The wish object(s)
  @public