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#hooks - Questions and answers

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3 points

Is the state updated when I submit a form in React?

I use a <form> in React and collect input data into a state using useState(). How to make sure that the data in the state is up-to-date when the 'submit' button is clicked?

1 answers

1060

0 points

React - how to call function with useEffect only once

React useEffect hook runs the passed function on every component change or when anything in the array of dependencies changes. What if I want to call initializeData function like in the class componen...

1 answers

737

0 points

React - why useContext returns undefined?

Take a look at these three components. Can some explain why Login component can't see the loginUser method from the authenticationService? Everything seems right: passing context, imports and yet it r...

2 answers

677

0 points

React - handleClick switch error

Do you know why my handleClick function throws an uncaught error? my code: stacktrace:

1 answers

791

0 points

React - what is the difference between useState and useReducer?

Hi, can someone explain to me what's the difference between useState and useReducer hook? React documentation says that "useReducer is usually preferable to useState...", so why should I use useReduce...

1 answers