nth = (array, index) => {
  if (!Array.isArray(array) || array.length < index) {
    return undefined
  }
  return array[index]
}
Return the Nth element of the given array.
@param {*} array - anything
@param {Number} index - index of the element to return
@returns {*} Nth element of the array, or undefined
@alias module:array-utils.nth
@example
let value = nth([1], 2) // undefined
let value = nth([1, 2, 3, 4, 5], 3) // 4