Rsa97

Promise.all([4, 5, 6])
  .then(console.log)
  .catch(console.log);

Promise.all([4, 5, 6])
  .then(data => console.log(data))
  .catch(err => console.log(err));

Как написано в описании циклов, с await может работать только for of

function sleep(delayms) {
  return new Promise((resolve) => setTimeout(() => resolve(), delayms));
}
async function foo() {
  for (i = 0; i < 10; i += 1) {
    await sleep(1000);
    console.log(i);
  }
  return 'done';
}
await foo();
// 0
// 1
// ...
// 9
// "done"

- const test = { fn({ test: 'test '}) }
+ const test = { field: fn({ test: 'test '}) };

for (let j = 0; j < arr[0].length; j += 1) {
  for (let i = 0; i < arr.length; i += 1) {
    res.innerHTML += `${arr[i][j]} `;
  }
  res.innerHTML += '<br>';
}

let response;
$(document).ajaxSuccess(function(e, xhr, settings) {
	response = xhr.responseJSON
});

const result = data.reduce(
  (acc, cur) => ((acc[cur.country] ??= []).push(cur.city), acc),
  {},
);

locale: (object) Allows you to provide localized strings for buttons and labels, customize the date format, and change the first day of week for the calendars. Check off locale in the configuration generator to see how to customize these options.