deferred-promise-use-case.js

// These theoretical API requests are deferred promises;
// Not executed until `.then()` is invoked.
let a = new Request('/foo');
let b = new Request('/bar');
let c = new Request('/baz');

// If invoked directly, then issue 3 direct HTTP requests:
Promise.all([ a, b, b ]).then((results) => {
  // GET /foo
  // GET /bar
  // GET /baz
});

// OR if you want to batch these API requests, then you could use
// the theoretical batch API endpoint and pass the requests in:
let batch = new BatchRequest([ a, b, c ]);
batch.then((results) => {
  // GET /batch?%2Ffoo,%2Fbar,%2Fbaz
});