Crowdly

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

Please, select the hook, the next statement is about:

Returns a memoized version of the function that only changes if one of the dependencies has changed.

useContext

useCallback

useReducer

useMemo

What the dependency array of useCallback should be in the code below?

we should remove the dependency array at all

100%

it should be like this: [addValue]

it should be left empty as it is

it should be like this: [addValue, setCount]

it should be like this: [setCount]

What the dependency array of useCallback should be in the code below?

we should remove the dependency array at all

it should be like this: [addValue]

it should be left empty as it is

it should be like this: [addValue, setCount]

it should be like this: [setCount]

Please, select the correct statements about Context:

It is impossible to update the value of context from nested component

Providers can be nested to override values deeper within the tree

One Provider can be connected to many consumers

Please, select the correct statements

Composition is used to make components co-dependable

If you want to reuse non-UI functionality between components, it is better to use inheritance

Composition is used to reuse code between components

Please, select what is true about React composition

It can be only achieved with class components

It can be only achieved by inheritance

It can be achieved with any type of components

It can be only achieved with functional components

There are cases where inheritance is more suitable than composition

Please, select examples of composition

25%