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In the cost component we have lifecycle cycle members to every former astronaut in this specific life

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cycle stage of our component to use if the host allow us to perform side effect in our functional component.

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So first we have to import the youth the Fed from we add

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and then inside the EP we can add a youth if at every candidate or this sentence and then we just create

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a function alert FDA as you see fit.

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So let's have a look and you can see the GM use if Red Alert allergies here and no matter how we type

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or delete the card or even we talk with a card.

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It also showed the alert year.

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So what can we do if you just want to alert ones only when the website is opened.

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We just need to add a square bracket here and now you can see these have to alert but when we do take

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a card or even we toggle does show showed high court it will not show the alert.

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So this is how we can perform the equivalent of component B mount using the use effect.

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Whoops.

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But how about if we just want to watch the card changes this time we are passing one way of dependency

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errors the second perimeter and inside our way we should pass the dependency that we want to what for

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example we just add that we want to wash the card.

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So we have to add the cots here.

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But you see there is some warning because the console was used to before it was defined.

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So we have to move these brought of course under the cards.

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So now you can see the alert.

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Yeah.

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At once if it will not to alert maybe toggle so hide button.

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But if we met some changes on the cards such as add some words and change the name it will show the

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alert because the day some changes on the cards or if we did the cause it also alert because it already

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did it.

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One of the data here and make some changes or to cut.

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So it will also alert the FTSE use if at.