Demonstrating Promise.all

promise_all.js

//Async load items from a remote API
loadItemsInStore(collection) {
  this.setState({ isFetchingItemsFromRemote: true});
  let promises = [];
  for(let c of collection.values()) {
    promises.push(ItemService.getItems(c.id));
  }
  
  let allPromises = Promise.all(promises);
  //Fulfill the Promise
  allPromises.then(() => {
    this.setState({ isFetchingItemsFromRemote: false});
  });
 }