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Course 2000032

Course 2000032

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What does it mean when people say "JavaScript is non-blocking" despite being single-threaded?

It refers to blocking all user interaction during async calls

It has no relation to asynchronous behavior

It literally runs multiple pieces of code on separate CPU cores simultaneously

It means JavaScript never waits for anything

Long-running I/O operations are offloaded (e.g., to browser APIs or Node's libuv) so the main thread isn't blocked while waiting

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How would you handle an error when using async/await syntax?

Errors cannot be handled with async/await

Using a try...catch block around the await expression

.catch() chained directly to the function call only

Using callbacks exclusively

async/await does not support error handling

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What does "0 == false" evaluate to?

Throws an error

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Which of these correctly lists all primitive types in modern JavaScript?

number, boolean, object, undefined

string, number, boolean, null, undefined, symbol, bigint

string, number, array, object, boolean

string, number, class, object

object, function, array, string

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Which keyword declares a variable that is function-scoped rather than block-scoped?

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Why are GET requests generally not used for state-changing actions in Rails (partly related to CSRF safety)?

GET requests can be triggered easily via links or images, making unintended actions more likely without proper protection

GET requests cannot carry parameters

GET requests are deprecated in HTTP

There is no difference between GET and POST for CSRF risk

GET requests are slower than POST

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What is the main purpose of Strong Parameters in Rails?

To speed up database queries

To protect against mass assignment vulnerabilities by whitelisting allowed attributes

To manage database migrations

To handle routing

To render views faster

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What is the main behavioral difference between .find and .find_by regarding missing records?

They behave identically

.find_by always raises an error

Neither ever raises an error

.find raises RecordNotFound, .find_by returns nil

.find returns nil, .find_by raises an error

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What is a key difference between "includes" and simply calling "joins" for solving N+1 problems?

They are functionally identical always

joins always solves N+1, includes never does

includes is designed for eager loading associations to avoid N+1, while joins is mainly for filtering with SQL joins without necessarily loading associations

joins loads full objects while includes does not query at all

includes cannot be combined with where clauses

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What is the purpose of "validates" in an ActiveRecord model?

To define routes

To render views

To handle HTTP requests

To create database tables

To ensure data meets certain criteria before being saved

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