JavaScript Promises, road to async/await - https://codingblast.com/javascript-promise-async-await

AsyncAwait.js

function someHelperFunctionThatReturnsPromise(value, error) {
  console.log('Inside someHelperFunctionThatReturnsPromise()');
  return new Promise(function(resolve, reject) {
    if (value) {
      resolve(value);
    } else {
      reject(error);
    }
  });
}

async function someAsyncFunctionThatAwaitsPromise(someValue) {
  console.log('Inside someAsyncFunctionThatAwaitsPromise()');
  let value = await someHelperFunctionThatReturnsPromise(someValue);
  return value;
}

async function anotherAsyncFunctionThatAwaitsAsyncFunction() {
  console.log('Inside anotherAsyncFunctionThatAwaitsAsyncFunction()');
  let value = await someAsyncFunctionThatAwaitsPromise('CodingBlast');
  console.log(value);
}