Set Value in Object at String Path

const object = {};
set(object, "a[0].b.c", 4);
console.log(object.a[0].b.c);
set(object, ["x", "0", "y", "z"], 5);
console.log(object.x[0].y.z);
console.log(object);

// 4
// 5
{
  a: [
    {
      b: {
        c: 4,
      },
    },
  ],
  x: [
    {
      y: {
        z: 5,
      },
    },
  ],
};

function helper(object, path, value) {
  const [current, ...rest] = path;

  if (rest.length > 0) {
    if (!object[current]) {
      const isNumeric = !isNaN(rest[0]);
      object[current] = isNumeric ? [] : {};
    }

    if (typeof object[current] === "object") {
      const isNumeric = !isNaN(rest[0]);
      object[current] = helper(isNumeric ? [] : {}, rest, value);
    } else {
      object[current] = helper(object[current], rest, value);
    }
  } else {
    object[current] = value;
  }

  return object;
}

function set(object, path, value) {
  let pathArr = path;

  if (typeof pathArr === "string") {
    pathArr = pathArr.replaceAll("[", ".").replaceAll("]", "").split(".");
  }

  // Recursive helper
  helper(object, pathArr, value);
}