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Introduction
Before the React hooks were introduced, it was not possible to use state in functional components. The React hooks transformed stateless functional components into stateful components in which state and lifecycle methods like functionality could be used.
The useState hook is the primary hook for declaring the state in a functional component. Using it, a state variable can be declared and initialized along with a function to manipulate it. But sometimes state gets complex and the useState hook is not efficient to handle it.
So React provides another hook for complex state management in functional components. This hook is called useReducer. In this article, we will discuss what useReducer hook is and how to use it.