What will happen if we change the state without any useEffect or event? (read/explore the react doc)

In React, state is a built-in feature that allows components to create and manage their own data. So, what happens if we change the state without any useEffect or event?

1. Direct State Change: If you try to change the state directly without using the setState() function or without any event like onClick, onChange etc., React will not recognize this change and the component will not re-render. This is because React's re-rendering process is tied to the setState() function, which triggers a re-render of the component.

2. Using setState(): If you change the state using the setState() function, React will schedule a re-render of the component. During this re-render, the component will read the new state and any changes will be reflected in the UI. This is the recommended way to change state in React.

3. Without useEffect: If you change the state without using useEffect, the component will still re-render if you used setState() to change the state. useEffect is used to perform side effects, like data fetching or manual DOM manipulation, and is not necessary for state changes to cause re-renders.

In conclusion, changing the state without any useEffect or event will still cause the component to re-render if you use the setState() function. However, changing the state directly without using setState() will not cause a re-render.