Question from the React ⚛️ test

Write a React component that displays the number 2

Hard

What will this component display?

const MyComponent=()=>{
    const[index, setIndex]= useState(1);
    setIndex(2);
    return<div>{index}</div>;
}

Author: Vincent CotroStatus: PublishedQuestion passed 3658 times

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Community Evaluations

Capucine

10/11/2023

Don't understand why it will create an infinite loop

Auteur anonyme

13/11/2023

Because updating your state will create a new render. You should only update your state conditionnaly (for exemple using a "onClick" or a condition) The loop will look like this : - Rendering - Updating state (with setIndex(2)) - Rendering - Updating state (with setIndex(2)) etc...

Capucine

13/11/2023

Thank you for the explanation !