🔧 In React why do we need state variable when we have local variable ?

So as a React developer, it is important to understand the significance of state variables in React development. React requires state variables as it does not keep track of local variables, so when you attempt to modify them, React does not re-render the DOM.

In React, state is a JavaScript object that stores data that can be modified over time. When the state of a component changes, React updates the UI to reflect the new state. The setState() method is a built-in method in React that is used to update the state of a component.

React keeps track of changes made to state variables. When a change is detected, React automatically re-renders the DOM tree using a process called reconciliation. The reconciliation process uses a diff algorithm to determine the most efficient way to make changes to the DOM tree, ensuring that updates to the UI are fast and efficient.

The primary advantage of using state variables is that they enable the efficient management of complex and dynamic user interfaces. By using state variables to manage the state of a component, the user interface remains responsive and up-to-date with user input.

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