React - useState hook example

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added Jan 9 in React by lcjr First Warrant Officer (11,930 points)
const [advTrxData, setAdvTrxData] = useState(null);

 

This line of code is written in JavaScript and is commonly used in React functional components. It utilizes the useState hook to create a state variable named advTrxData and a corresponding function named setAdvTrxData.

Here's a breakdown of each part:

  • const: This keyword is used to declare a constant variable.

  • [advTrxData, setAdvTrxData]: This is array destructuring, where it extracts two elements from the array returned by the useState hook. The first element, advTrxData, represents the current state value, and the second element, setAdvTrxData, is a function that can be used to update the state.

  • useState(null): This is a call to the useState hook, initializing the state variable advTrxData with an initial value of null. The useState hook is part of React and is used to add state to functional components. It returns an array where the first element is the current state value, and the second element is a function that can be used to update the state.

In summary, this line of code declares a state variable advTrxData initialized with null, and the corresponding function setAdvTrxData that can be used to update this state variable in a React functional component.

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