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I try use promise, but it's work strange:

const p = new Promise(function(resolve, reject) {
  setTimeout(resolve, 100);
  setTimeout(reject, 200);
});

p.then(function() {
    console.log('resolved');
}).catch(function() {
    console.log('rejected');
});

output:

resolved
Uncaught Error: Unhandled promise rejection: undefined

Bolded text printed, because reject called after resolve, but promise must be ignore change state at second call.

And what about async\await?