Function nth

code/solutions/04_3_a_list.js:21–25

(list, n)

}

function nth(list, n) {
  if (!list) return undefined;
  else if (n == 0) return list.value;
  else return nth(list.rest, n - 1);
}

console.log(arrayToList([10, 20]));
// → {value: 10, rest: {value: 20, rest: null}}