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Advanced Frontend with React.js [Eng+Ukr]

Advanced Frontend with React.js [Eng+Ukr]

Looking for Advanced Frontend with React.js [Eng+Ukr] test answers and solutions? Browse our comprehensive collection of verified answers for Advanced Frontend with React.js [Eng+Ukr] at softserve.academy.

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Is there everything ok with the useData hook?

where useUserId is also a custom hook:

Error: Invalid hook call... - because we cannot call custom hooks from custom hooks

❌

Error: Invalid hook call... - because you can only call hooks at the top level

The code is ok

Infinite loop

Suppose, we have the next code:

What will happen if ComponentA updates value by calling setValue?

value will be updated, ComponentA will not be rerendered

value will not be updated, ComponentA will not be rerendered

value will be updated, ComponentA will be rerendered

error

Infinite loop

value will not be updated, ComponentA will be rerendered

View this question

Will the ErrorBoundary component handle the error in the code below?

No, because error boundary component can handle only issues of children components wrapped with this error boundary component

It will work as if the whole SimpleComponent was wrapped inside of ErrorBoundary

Error that happens in the js does not affect rendering of SimpleComponent. ErrorBoundary is not needed here

Yes, it will handle the jsx inside of it

View this question

Will the error be handled by error boundary?

(given that we are not using react-error-boundary package and ErrorBoundary is the usual error boundary component)

no, because error boundaries do not catch errors in event handlers

yes, because error boundaries catch errors in the components below them in the tree

yes, because error boundaries catch errors in the in the event handlers

No, because the thrown error will not break React component tree

View this question

Is there everything ok with the useData hook?

where useUserId is also a custom hook:

Error: Invalid hook call... - because we cannot call custom hooks from custom hooks

❌

Error: Invalid hook call... - because you can only call hooks at the top level

The code is ok

Infinite loop

What MUI customization variant does this code describe?

Global theme variation

❌

One-off customization

Reusable component

Global CSS override

View this question

This is the code in App.js and Button.jsx. What can you see as a result?

Button.js

App.js

❌

View this question

How often will the memorization be recomputed?

only once

❌

never

❌

on every other click on a button

✅

this code causes an infinite loop of rendering

❌

on every click on a button

❌

View this question

How often the rendering of a Child component will happen?

only once

❌

never

❌

this code causes an infinite loop of rendering

❌

on every click on a button

✅

View this question

We have a component that uses useContext hook:

Can this hook cause a rerender?

Yes. Every time when the nearest <MyContext.Provider> above the component updates

✅

No. useContext never causes rerendering

❌

We need to add a subscription for rendering explicitly, otherwise, rerender will not be executed

❌

View this question

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