ThinkPalm Technologies React Js Frontend Developer Interview Questions and Answers

useContext API is used in React to pass data through the component tree without having to pass props down manually at every level.

• Create a context using createContext() method

• Wrap the parent component with and pass the value

• Access the context value in child components using useContext(ContextName)

Reducer in Redux is a pure function that takes the previous state and an action, and returns the next state.

• Reducers are used to update the state in Redux store in response to actions.

• They are pure functions, meaning they do not modify the state directly but return a new state based on the previous state and the action.

• Example: const counterReducer = (state = 0, action) => { switch(action.type) { case 'INCREMENT': retu...read more