JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - setTimeout / 182

This lecture explains the concept of setTimeout in JavaScript, highlighting its asynchronous nature and how it allows code execution to be delayed. The instructor demonstrates the use of setTimeout with examples, explaining the JavaScript runtime environment, including the call stack, memory heap, and event loop. The lecture emphasizes the non-blocking nature of asynchronous code and how the event loop manages execution. The session concludes with an advanced example to solidify understanding.

What is the primary purpose of the setTimeout function in JavaScript?

• To execute code only once

• To execute code in a random order

• To execute code after a specified delay

• To execute code immediately

How does setTimeout affect the execution flow of JavaScript code?

• It executes the code in reverse order

• It speeds up the execution of the code

• It allows the code to execute asynchronously

• It blocks the execution until the timeout is complete

What is the role of the call stack in JavaScript's runtime environment?

• To handle asynchronous tasks

• To execute code in parallel

• To manage the order of function execution

• To store variables and functions

Which component of the JavaScript runtime environment is responsible for handling delays and asynchronous tasks?

• Event loop

• Web API

• Call stack

• Memory heap

In the example with nested functions, what determines when a function is executed?

• The number of parameters

• The order in which they are written

• The size of the function

• The availability of the call stack

What is the event loop's primary function in JavaScript?

• To execute code in parallel

• To check if the call stack is empty and manage the callback queue

• To store variables and functions

• To handle errors in the code

Why might the actual delay of a setTimeout be longer than specified?

• Because the browser is slow

• Due to other tasks occupying the call stack

• Because setTimeout is inaccurate

• Due to network latency

What does a minimum delay in setTimeout mean?

• The delay is unpredictable

• The delay will always be exactly as specified

• The delay will be less than specified

• The delay will be at least the specified time but could be longer

How does JavaScript handle multiple asynchronous tasks?

• By queuing them in the callback queue and executing when the call stack is empty

• By executing them immediately

• By executing them in parallel

• By ignoring them until all synchronous tasks are complete

What is a potential use of setTimeout in simulating asynchronous operations?

• To handle errors in the code

• To execute code in parallel

• To simulate waiting for a web API response

• To block code execution