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Advanced Frontend with React.js [Eng+Ukr]

Advanced Frontend with React.js [Eng+Ukr]

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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]

❌

View this question

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]

❌

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

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]

View this question

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]

❌

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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