Promises - parallel

gistfile1.js

const asyncA = () => Promise.resolve('A');
const asyncB = () => Promise.resolve('B');

// Please write a function that calls these 2 async functions in parallel and combines the results into a single object.
// asyncA and asyncB are independent, should be called in parallel.
const callAsync = () => {
  // your code should be here
  // ...
}

callAsync().then(result => console.log(result)); // should print: {a: 'A', b: 'B'}