Eloquent JavaScript - chapter 4

eloquentjs-chapter4

function arrayToList(arr) {
  
  let list = { value: arr[arr.length - 1], rest: null };
  
  for ( let i=arr.length - 1; i>=0; i--) {
    list = { value: arr[i], rest: list}
    
  }
  
  return list;
}

console.log(arrayToList([1,2,3]));


function listToArray(list) {
  let arr = [];
  
  while(list.rest) {
    arr.push(list.value);
    list = list.rest;   
  }
  
  return arr;
  
}

console.log(listToArray(arrayToList([1,2,3])));