Скачать или смотреть React Hooks [1] : What is useState() ?

useState is a React hook that allows you to add state to a functional component.
In this example, we're using useState to define a state variable called count and a function called setCount that will update the value of count. We're initializing count to 0 by passing it as an argument to useState.

Then we define a function called increment that updates the count state variable by calling setCount with the new value of count (which is count + 1).

Finally, we render the current value of count inside a 👍p👍 element and a button that, when clicked, calls the increment function.

When the user clicks the button, the increment function updates the count state variable, and the component re-renders with the new value of count. This is the basic idea behind using useState to add state to a functional component in React.
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