I'm playing around with React hooks and faced a problem. It shows the wrong state when I'm trying to console log it using button handled by event listener.  CodeSandbox: https://codesandbox.io/s/lrxw1wr97m   Click on 'Add card' butt...
According to the docs:     componentDidUpdate() is invoked immediately after updating occurs. This method is not called for the initial render.   We can use the new useEffect() hook to simulate componentDidUpdate(), but it seems like useEffect() is...
I have something like:   const [loading, setLoading] = useState(false);  ...  setLoading(true); doSomething(); // <--- when here, loading is still false.    Setting state is still async, so what's the best way to wait for this setLoading() cal...
I am trying to figure out how to use a Firebase listener so that cloud firestore data is refreshed with react hooks updates.   Initially, I made this using a class component with a componentDidMount function to get the firestore data.  this.props.fir...
The standard way to use a React useState Hook is the following:  const [count, setCount] = useState(0);   However this const count variable is clearly going to be reassigned to a different primitive value.  Why then is the variable not defined as let...
In the official docs of React it mentions -       If you’re familiar with React class lifecycle methods, you can think   of useEffect Hook as componentDidMount, componentDidUpdate, and   componentWillUnmount combined.   My question is - how can we...
Using the useContext hook with React 16.8+ works well. You can create a component, use the hook, and utilize the context values without any issues.  What I'm not certain about is how to apply changes to the Context Provider values.  1) Is the use...
I'm trying to understand what the use case is for using React's useCallback hook in place of the useEffect hook.  They both appear to act as a listener for state changes of their inputs (examples taken from the React Docs):  useEffect(   () =...
I have just began playing around with React hooks and am wondering how an AJAX request should look?  I have tried many attempts, but am unable to get it to work, and also don't really know the best way to implement it. Below is my latest attempt:...
Currently Im using functional component with react hooks. But i unable to test the useState Hook completely. Consider a scenario like, in useEffect hook i'm doing api call and setting value in the useState. For jest/enzyme i have mock data to tes...

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