JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - setInterval / 183

The lecture discusses JavaScript's setTimeout and setInterval functions. It explains the behavior of setTimeout with a zero delay, highlighting that the delay is a minimum and can be longer due to the call stack. The setInterval function is introduced, showing how it repeatedly calls a function at specified intervals. The importance of managing setInterval with clearInterval to prevent it from running indefinitely is emphasized.

What is the expected output when setTimeout is used with a zero-millisecond delay?

• The output is always CBA.

• The output is always ACB.

• The output can be either ABC or ACB.

• The output is always ABC.

Why does JavaScript not execute setTimeout immediately even with a zero-millisecond delay?

• Because the call stack is always busy.

• Because the event queue must wait for the call stack to be empty.

• Because JavaScript is a compiled language.

• Because zero milliseconds is not a valid delay.

What is the role of the Web API in the context of setTimeout?

• It logs the output to the console.

• It handles the waiting period and queues the callback function.

• It compiles the JavaScript code.

• It executes the callback function immediately.

What is the significance of the minimum delay in setTimeout?

• It prevents the function from executing.

• It ensures the function executes immediately.

• It is the exact time the function will be delayed.

• It is the shortest possible delay, but actual delay can be longer.

What does setInterval do in JavaScript?

• Stops a function from executing.

• Executes a function only if the call stack is empty.

• Executes a function repeatedly at specified intervals.

• Executes a function once after a delay.

Why is it important to clear intervals in JavaScript?

• To ensure the function executes immediately.

• To prevent the function from running indefinitely.

• To stop the function from executing once.

• To prevent memory leaks.

How can you stop a setInterval from running?

• By using clearTimeout.

• By using clearInterval with the interval's reference.

• By setting the interval delay to zero.

• By closing the browser.