Asynchronous JavaScript (original) (raw)

What is the purpose of the setTimeout function?

• Executes a function repeatedly at fixed intervals
• Executes a function once after a delay
• Executes a function immediately
• Cancels a delayed function

What does the then() method of a Promise do?

• Handles rejected promises
• Cancels an unresolved promise
• Converts a callback to a promise
• Handles fulfilled promises

Which method allows handling errors in promises?

What does async do when used with a function?

• Makes the function synchronous
• Automatically wraps the function's return value in a promise
• Stops the execution of the function
• Immediately executes the function

What is the purpose of the await keyword?

• Delays code execution indefinitely
• Converts a promise into a callback
• Pauses execution of an async function until a promise resolves
• Handles rejected promises

What is the difference between setTimeout and setInterval?

• setTimeout runs once, while setInterval executes repeatedly at intervals
• setTimeout executes repeatedly, while setInterval runs once
• Both execute functions immediately
• Both are used for canceling asynchronous tasks

What is the event loop's role in JavaScript?

• To execute synchronous code
• To prioritize promises over callbacks
• To manage and execute asynchronous operations in the call stack

Which queue has a higher priority in the JavaScript event loop?

What is the output of the following code?

JavaScript `

console.log("A"); setTimeout(() => console.log("B"), 0); Promise.resolve().then(() => console.log("C")); console.log("D");

`

What is the purpose of Promise.finally()?

• Executes only when a promise is fulfilled
• Executes only when a promise is rejected
• Cancels unresolved promises
• Executes after a promise is settled, regardless of its state

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