javascript - From string of keys to hash value

Question

I have a hash like the one below

aa: {
  categories: {
   cat1: 'alpha'
  }
}

Starting from the string 'aa.categories.cat1', how can I get alpha suing plain JS?

Answer 1

Using split() and reduce():

const result = path.split('.').reduce((a, v) => a[v], object);

---

Complete snippet:

const object = {
  aa: {
    categories: {
      cat1: 'alpha'
    }
  }
}

const path = 'aa.categories.cat1';

const result = path.split('.').reduce((a, v) => a[v], object);

console.log(result);