I have an array where each index with the same name should be counted in the object. Please check the example and result below. I'm trying to figure out a few things:

1. how to create two new objects "viktor" and "kate" inside the object ?
2. how to provide a calculation for each key if they are the same: "apple", "grape", "orange", "apple" and "banana" ?

const obj = {
  viktor: ["apple", "grape", "orange", "apple", "banana"],
  kate: ["grape", "orange", "apple", "grape", "banana"]
};

function calc(a) {
}

console.log(calc(obj));

// result of calc method should be equal to
// {
//   viktor: {
//     apple: 2,
//     grape: 1,
//     orange: 1,
//     banana: 1
//   },
//   kate: {
//     apple: 1,
//     grape: 2,
//     orange: 1,
//     banana: 1
//   }
// }