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ECMAScript: Automation and System Integration

ECMAScript: Automation and System Integration

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Why is it a problem if JavaScript blocks for a long time in the browser (doesn't return control)?

Because the HTML is deleted and reloaded

Because the browser then automatically starts multiple threads for JS

Because the CSS stops and never loads again

The page may appear "frozen": it does not respond to clicks, scrolling, or input

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What is Promise .catch(... ) used for?

To "speed up" the Promise so it finishes earlier

To make the Promise run synchronously

To run multiple callbacks at the same time

To handle asynchronous errors (rejections)

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True or false: await can only be used inside an async function.

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We set a variable inside a setTimeout callback, then read it immediately afterwards in synchronous code. What will we observe?

The program won't even compile, because setTimeout can only be used with async/await

The synchronous read happens before the callback, so we see the old value

The two operations definitely run simultaneously, so the result is random

The callback always runs first, so we see the new value

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What does it mean to start an operation asynchronously in JavaScript?

We start the operation, and the program can continue running; the result arrives later

Asynchronous operations exist only in Node.js, not in browsers

The operation runs only if there are multiple CPU cores

The program always stops and waits until the operation finishes

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Which are the three typical states of a Promise?

open, closed, locked

start, middle, end

pending, fulfilled, rejected

ready, running, done

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What does a try/catch block in an async function catch if an awaited Promise becomes rejected?

The browser automatically retries the Promise

We catch the error in the catch branch (as an exception)

The error is always lost and cannot be handled

Nothing, catch is only for synchronous errors

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True or false: setTimeout(fn, 0) means

that the callback is guaranteed to run before the next synchronous line in the queue.

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Which statement best describes a Promise?

An object that represents a future value or an error

A variable that can only store strings

A synchronous loop that waits for a network response

A browser event that is generated on click

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What is addEventListener for?

It disables all events on the given element

It creates a Promise from every click

We subscribe to an event, providing the callback

It immediately runs the callback and removes the event handler

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