Deep copy

function itemCopy(item) {
  // Check if item is null or not an object; if so, return it as is (base case for recursion)
  if (item === null || typeof item !== "object") {
    return item;
  }

  // Check if item is an array, perform a deep copy of the array
  if (Array.isArray(item)) {
    let arr = [];
    // Iterate over all elements of the array and recursively copy them
    for (let [index, value] of item.entries()) {
      arr[index] = itemCopy(value);
    }
    return arr; // Return the new array
  }

  // Check if item is an object, perform a deep copy of the object
  if (item instanceof Object) {
    let obj = {};
    // Iterate over all properties of the object and recursively copy them
    for (let [key, value] of Object.entries(item)) {
      obj[key] = itemCopy(value);
    }
    return obj; // Return the new object
  }
}

function createDeepCopy(...items) {
  const finalCopy = [];
  // Iterate over all provided items and add their deep copies to finalCopy
  for (let i = 0; i < items.length; i++) {
    finalCopy.push(itemCopy(items[i]));
  }
  return finalCopy; // Return the array with deep copies of the items
}

console.log(createDeepCopy([2, 10, 14, 100], { 1: "value" }, 1));